Check your computer's manufacture 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, right-click "This PC" or "My Computer" on your desktop, select "Properties," and look for "System." You'll see an "Installed on" date. On a Mac, click the Apple menu, select "About This Mac," and check the "System Report" button. The date listed under "System Software Overview" shows when macOS was installed on that particular machine.

This date is a starting point, not a may provide. If the previous owner wiped and reinstalled the system, or if you upgraded from Windows 10 to Windows 11, the date will reflect that event, not the original purchase date.

Key Takeaways

  • Windows and macOS both store an installation date in system settings, which usually matches the computer's age but can be reset if the system was reinstalled.
  • Your computer's serial number and model information are printed on the case or battery and can be looked up on the manufacturer's website to find the manufacture date.
  • The BIOS or firmware date (the deepest layer of your computer's software) is older than the operating system and shows when the hardware was built.
  • If you bought the computer new, your receipt or invoice is the most reliable proof of age, since system dates can change.
  • Older computers often show their age through hardware wear, battery health, and performance, even if the exact date is unclear.

Look up the serial number on the manufacturer's website

Every computer has a unique serial number printed on the case, battery, or bottom panel. This number lets the manufacturer tell you exactly when that specific machine rolled off the assembly line. Find the serial number by looking at a sticker on your computer's chassis — it's usually on the back or bottom.

Once you have the serial number, go to the manufacturer's support website. Dell, HP, Lenovo, Apple, ASUS, and others all have lookup tools where you enter the serial number and get back the manufacture date, warranty information, and sometimes the original configuration. The date you get this way is the most accurate, because it comes from the factory records.

If you can't find a sticker, the serial number is also stored in your system settings. On Windows, open Command Prompt and type wmic bios get serialnumber. On a Mac, go to "About This Mac" and click "System Report," then look under "Hardware" for "Serial Number."

Check the BIOS or firmware date for the hardware layer

Below the operating system sits the BIOS (on Windows machines) or firmware (on Macs), which is the lowest-level software that runs before Windows or macOS even starts. This layer was written when the hardware was manufactured, so its date is often older than your operating system installation date and closer to the true age of the machine.

On Windows, open Command Prompt and type systeminfo. Look for "BIOS Version" and "System Boot Time." The BIOS version often includes a date. On a Mac, go to "About This Mac," click "System Report," and look under "Hardware" for "Boot ROM Version." The version number sometimes includes a date, though Apple's format varies.

The BIOS or firmware date is usually within a few months of when the computer was actually built, making it more reliable than the operating system installation date. However, it's still not a may provide — manufacturers sometimes update the BIOS after shipping, or a technician may have flashed a newer version.

Use your original receipt or invoice if you have it

If you bought the computer yourself and kept the paperwork, your receipt or invoice is the most straightforward proof of age. The purchase date on that document is when you got the machine, which is what most people mean when they ask "how old is my computer."

Look for the original email receipt if you bought online, or check your credit card or bank statements if you've lost the physical receipt. Many retailers and manufacturers keep purchase records tied to your account, so you can also log into your account on Dell.com, Apple.com, or wherever you bought it and find the order history.

If you inherited the computer from someone else or bought it used, ask the previous owner for their receipt. If that's not possible, the serial number lookup and BIOS date are your next-best options.

Look at hardware condition and performance to estimate age

If you can't find any dates, the physical state of the machine can give you clues. A computer that's five years old often shows visible wear: the keyboard may be shiny from use, the battery may hold charge for only an hour or two, and the fan may sound loud because dust has built up inside. A computer that's ten years old may have yellowed plastic, a cracked screen bezel, or a battery that barely holds any charge at all.

Performance is another hint. If your computer struggles to run modern software, freezes often, or takes a long time to start up, it's likely older — though a slow computer can also be slow because the hard drive is failing or the system is cluttered with files. Check your hard drive health using free tools like CrystalDiskInfo on Windows or Disk Utility on Mac. A failing drive is a sign the computer has been in use for years.

These clues are rough estimates, not precise dates. A well-maintained older computer can look and run like a newer one, and a neglected newer computer can look worn out. Use them as a secondary check, not your primary method.

Find the model year from the model number

Many manufacturers encode the year of manufacture into the model number itself. For example, MacBook Pro models from 2019 have "2019" in their official name. Dell and HP often include a generation number that corresponds to a year, though the system varies by product line.

To find your exact model, go to "About This Mac" on a Mac or "System" in Settings on Windows. Look for "Model" or "Model Name." Then search that model name on the manufacturer's website or on a tech specs database like Everymac.com (for Apple) or the Dell or HP support pages. The specs page will list the year the model was released.

This tells you when that model line came out, not necessarily when your individual machine was built. A 2019 MacBook Pro model could have been manufactured in 2019 or 2020. Combine this with the serial number lookup for a more precise answer.

Frequently Asked Questions

Can I tell how old my computer is just by looking at it?

Not precisely. Physical wear, battery condition, and performance can suggest a computer is old, but they're not reliable. A five-year-old computer that's been well cared for can look new, and a two-year-old computer that's been heavily used can look worn. Use the system settings, serial number, or receipt for an actual date.

What if the system installation date is much newer than I remember buying the computer?

Someone likely reinstalled Windows or macOS on the machine after you bought it. This could have been you, a technician, or the previous owner if you bought it used. Check the serial number on the manufacturer's website instead — that date won't change unless the hardware itself was replaced.

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

Usually it's within a few months of manufacture, but not always. Manufacturers sometimes update the BIOS after the computer ships, or a technician may have flashed a newer version. The serial number lookup is more reliable if you need a precise date.

My computer is so old I can't find the serial number sticker. What do I do?

Try the Command Prompt method on Windows (wmic bios get serialnumber) or System Report on Mac — the serial number is stored in the system even if the sticker is worn away. If that doesn't work, the BIOS date and physical condition are your remaining options.

Why does my computer's age matter?

Knowing your computer's age helps you decide whether to repair it or replace it, understand how much longer the battery or hard drive might last, and plan for software updates. Older computers may not support the latest operating systems or security patches, which affects how safe they are to use online.