Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
When talking about old computers and a Linux distro to make them usable again, most people think "Puppy Linux."
Puppy is indeed amazing! I tried it on my old computer and I liked it.
However, there might be people who might not be comfortable with Puppy. I remember Puppy had problems "catching" my mouse. Also, Puppy seems not to be multilingual...it asks for your locale, but at the end, I got an English desktop.
So, for those who want to revive an old PC, don't feel comfortable with Puppy or don't speak English, there is an alternative...GALPon MiniNO Linux. MiniNO is a Spanish word for "cat"; it even "caught my mouse"!