Depends.
If sh stuff is hardly used it’s fine. I have a coresaver I hardly ever wear which the previous owner also hardly wore. As below though, I’d be suspicious of knee pads etc sh.
My old kneepads, however pprobably stink and the straps have stretched so that I can’t trust them to stay in place on impact and they’re therefore useless although the actual pad part is still fine.
My old elbow pads were worn about twice as they felt uncomfortably like having books strapped to my elbows.
Decide which items you need and how much you’re prepared to spend, then go trying things on.
If you foresee hard OTBs then something like a subgear tee might be worth considering. Cracked ribs hurt. A coresaver is better but hotter / less comfortable.
I’ve just gone POC for pads after deciding I was okay with the price versus interruption to daily life of injuries…