Hi,
You can still download and use some older versions of Linux Mint in 32bit versions. I think they are still supported until the end of next year.
I guess the main issue is what you want to use it for? I think web browsers are dropping 32bit support and overall such an old machine will not work well on the web unless you are using a non-java enabled mode. For other uses (email client or server, logging, word processing, music playing or streaming, etc) it should still be OK.
73.