Welcome. I'll just say that before knowing what your 30 year old system is, it's possible that it is great as it is, so tread carefully when considering changing stuff, as you may find that you drop perfectly good and serviceable equipment for something new with no or marginal benefits, and a significant outlay.
I'm running speakers from the 70s, a record player from the 80s, a CD player from the 90s, and an amp from the 2010s and it's great!