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I have an Asus laptop from 2007
(lemmy.world)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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I have an Asus Eee PC from 2009 running Puppy Linux (as a secondary device).
As already pointed out you will need a leightweight distro and desktop environment.
https://distrochooser.de/ (available in English) can help you find the right distro, it takes into account the age of your device, your Linux knowledge, use case and a lot more.