I’ve been able to play some older basses, 20-30 years old, but nothing that’s 60s vintage. For me it isn’t so much older basses sound better but it’s more that they’ve been setup and tweaked so many times that some of them are so finely tuned they just play better. And maybe that somehow equals sounding better, which again is just my opinion or experience. Also, again personally, but basses that have been around a while I feel I can trust them more. Which leads to me playing more freely and not worrying about something going wrong with the instrument as much. It’s almost like I can let my guard down more on an older broken in bass and just have fun instead of worrying about keeping my brand new bass mint for as long as possible.