Check Your Computer's Manufacturing Date in System Settings

The fastest way to find your computer's age is to look at the system information built into Windows or macOS. This tells you when the operating system was installed, which is usually close to when you bought the machine—though not always, especially if someone reinstalled the system later.

On Windows 10 or 11, right-click the Start button and select "System." Scroll down to "Device specifications" and look for "System type" and the build number. This shows the OS version but not the original manufacture date. Instead, open Command Prompt (search for "cmd"), type systeminfo, and press Enter. Look for "Original Install Date"—that's when Windows was first installed on this machine.

On macOS, click the Apple menu, select "About This Mac," and look at "System Report." Click "Hardware" and find "Hardware Overview." The date listed under "Serial Number" section won't show age directly, but you can use the serial number (explained below) to look up manufacture date on Apple's website.

Key Takeaways

  • Windows shows the original OS install date in Command Prompt using the systeminfo command, which usually matches when you first got the computer.
  • Your computer's serial number, found in system settings or on a physical label, can be looked up on the manufacturer's website to confirm the exact manufacture date.
  • BIOS or firmware information displays the date the system was last updated, which is different from the computer's age and less reliable for determining purchase date.
  • Physical inspection—checking the condition of ports, stickers, and the battery—can give you a rough sense of age when digital records are missing.
  • If you bought the computer used, the manufacture date will be older than your purchase date, so cross-check with your receipt or email confirmation.

Use the Serial Number to Look Up Manufacture Date

Every computer has a unique serial number printed on the case and stored in the system. This number lets you find the exact date the manufacturer built the machine, which is more reliable than the OS install date.

Find your serial number by opening System Information (Windows: search "System Information"; macOS: Apple menu > About This Mac > System Report). Write down the serial number exactly as it appears. On Windows machines, you can also find it printed on a sticker on the bottom or back of the laptop, or inside the case if it's a desktop.

Go to the manufacturer's support website—Dell, HP, Lenovo, Apple, Asus, or whoever made your computer. Search for "check serial number" or "product information lookup." Paste your serial number into their tool. The result will show the manufacture date, warranty period, and sometimes the original configuration. This date is when the computer left the factory, so it's typically a few weeks to a few months before you bought it.

Check the BIOS or Firmware Date (Less Reliable)

The BIOS (on Windows) or firmware (on Mac) is the software that runs before the operating system loads. Its date can give you a clue about the computer's age, but it's not a direct measure—the BIOS date updates whenever the manufacturer releases a patch, so an old computer with recent updates will show a recent date.

On Windows, restart your computer and press Delete, F2, or F12 during startup (the exact key varies by manufacturer—watch the boot screen). This opens BIOS setup. Look for "System Date" or "BIOS Date" in the main menu. Write down the date, but remember this may have been updated since the computer was made.

On macOS, restart and hold Command + Option + P + R to reset the firmware. The date won't display during this process, but you can check firmware version in System Report (Apple menu > About This Mac > System Report > Hardware). The version number sometimes includes a date code, though it's not always clear.

Look at Physical Signs of Age

If you can't find digital records, the computer's physical condition offers clues. Older machines show wear in predictable ways: yellowed plastic, faded stickers, worn keyboard keys, and corroded ports. Newer computers have brighter plastics, crisp logos, and shiny metal.

Check the battery if it's removable (older laptops often had removable batteries; newer ones don't). The battery usually has a manufacture date printed on it. Look at the power adapter and cables—frayed cords and cracked plastic suggest age. Inspect the keyboard and trackpad for shine worn into the surface, which happens over years of use. Dust inside the vents, visible through the grilles, also suggests the machine has been running for a while.

These signs are rough estimates only. A well-maintained five-year-old computer can look newer than a neglected two-year-old one. Use physical inspection as a backup when digital methods don't work, not as your primary source.

Cross-Check with Your Purchase Records

If you bought the computer yourself, your receipt or email confirmation is the most straightforward proof of age. Check your email for order confirmations from the retailer or manufacturer. Look through credit card or bank statements from around the time you think you bought it—the transaction date is usually within a day or two of the purchase.

If you bought it used, the manufacture date will be older than your purchase date. The original owner's receipt won't be available to you, but the serial number lookup will still show when the computer was made. Subtract the manufacture date from today's date to find the computer's true age, then note separately how long you've owned it.

For computers given as gifts or inherited, ask the person who gave it to you when they bought it. If that's not possible, the serial number and OS install date are your best remaining options.

Understand Why the Install Date Differs from Manufacture Date

The original OS install date (from Command Prompt or System Report) usually matches the manufacture date within a few weeks, because most computers ship with the OS already installed. However, several situations create a gap between these dates.

If someone reinstalled Windows or macOS after you bought the computer—to fix a problem, upgrade the OS, or wipe the drive—the install date resets to that day. A computer from 2015 might show an install date of 2023 if the OS was reinstalled. If you upgraded from Windows 10 to Windows 11, the install date may update to the upgrade date. Refurbished computers often have a fresh OS install, so the date reflects when the refurbisher prepared it, not when it was originally made.

This is why the serial number lookup is more reliable: it shows when the hardware was manufactured, regardless of what happened to the software afterward.

What to Do If You Can't Find the Serial Number

If the serial number sticker is missing or unreadable, try these alternatives. On Windows, open Command Prompt and type wmic bios get serialnumber, then press Enter. The serial number will appear on the next line. On macOS, go to Apple menu > About This Mac > System Report > Hardware and look for "Serial Number" in the Hardware Overview section.

If the digital serial number doesn't work or the manufacturer's lookup tool is unavailable, contact the manufacturer's support team directly with your computer's model number (also in System Information). They can sometimes look up the manufacture date by model and approximate age, though they may ask for proof of ownership.

As a last resort, the OS install date combined with physical inspection gives you a reasonable estimate. A computer with a 2018 install date and visible wear is probably from 2018 or earlier, not newer.

Frequently Asked Questions

Why does my computer show an install date from last year when I bought it five years ago?

Someone likely reinstalled the operating system after the original purchase. This resets the install date to the day of reinstallation. Use the serial number lookup instead—it shows the actual manufacture date, which is what you need to know the computer's true age.

Can I tell how old my computer is just by looking at the model number?

Model numbers sometimes include year codes, but they're not consistent across manufacturers. A model number like "ThinkPad X1 Carbon Gen 9" tells you it's a ninth-generation model, but not the exact year. Use the serial number lookup for a precise date instead.

What if the manufacturer's website won't look up my serial number?

Some older computers are no longer in the manufacturer's database. Try contacting their support team by phone or email with your serial number and model number. If that fails, the OS install date and physical condition are your best remaining clues.

Does the BIOS date tell me when my computer was made?

Not reliably. The BIOS date updates whenever the manufacturer releases a security patch or firmware update. An old computer with recent updates will show a recent BIOS date. Use the serial number lookup instead for the actual manufacture date.

How do I know if my computer is too old to use safely?

Age alone doesn't determine safety—a well-maintained ten-year-old computer can be safer than a neglected two-year-old one. What matters is whether the manufacturer still releases security updates for your operating system. Check the manufacturer's support page for your OS version to see the end-of-life date.