Most TT can be brought back to life by replacement belts and new styli (when replaceable) or cartridge/styli combo. The investment is pretty cheap and very effective.
With the rubber-band type belt TT, they last about 10 years; however, many people never replace them and wonder why their TT doesn't maintain speed properly or flat-out doesn't work at all.
Also stylii only last a finite amount of time. I'd estimate about 5 yeats of regular playing or equiv. Cartridge/stylii are also responsible for the personality or signature of the 'hi-fi' sound. FWIW, the tried-and-true Chevrolet-of -cartridges is Shure brand. Available for cheap - about $30-$35. Sure M95 and M91ED are the most- often used as the go-to replacements. I just poked around on EBay and saw M91ED for $35. I've done this install replacement dozens of times for friends and they've raved about the improvement. No matter how tone-deaf they were they felt the improvement.
Also not known to many people with TT, there's a maintenance item that you can do some of the time. A drop or two of sewing-machine oil (very light viscosity) iside the spindle area. It can be accessed from underneath or when you pull the platter off. A drop or two goes a long way to allowing the bearings to move more freely. Some TT are not able to benefit but I figure it's worth mentioning to those that can lift off the platter (most times you can.)