Just found my dad's Pioneer PL-600 (black) unused since 1975, have some questions

I was rooting through my parents' basement and found an extremely dust-covered Pioneer PL-600 (black) that my dad got back in the '80s. By his own account he used it "a couple of times" back then and never since.

Its overall intact with dust cover and all the parts. I gave it a quick spin and everything seemed to be in working order. I tried it out on some junkier records and it sounded just fine (after adjusting the speed screw a bit).

My main question is should the cartridge be replaced? Its almost 30 years old (which would lead me to replace it) however it was used only a handful of times during that period. Also, should I worry about the belt breaking, i.e. should I preemptively order a new one? Is 40 years enough time to cause the material to break down, event without being played?

Thanks!

Edit: not from 1975; it came out in the '80s.