89
Firefox 145.0 released
(www.firefox.com)
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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.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
And, while I like old hardware, the first x86-64 chips shipped in 2003. So, this is not exactly a Windows 11 situation.
Hardware older than that is going to struggle with modern browsers. A PC from that era would probably have less than 1 GB of RAM and perhaps a max RAM well under 4 GB (the theoretical limit). Using older software versions is probably best anyway.