My pre-recorded 7" Reel to Reel 1/4" wide tapes (had over 500 of them, now about 300) average 50 years old, (a few are 7-1/2 IPS 2 Track stereo from 1956, soon to be 70 years old). They are the best sounding format I own.
My friend's 15ips tapes blow these away. I'm always surprised how many obsess over cables, fuses, expensive miniscule tweaks and don't get into tape for it's undeniable superior sound.
8 track cartridges were supposed to be for short lived ad campaigns played on the radio, throw them out after a short while;1/8" wide cassette was supposed to be for dictation,
and yet technology advanced these transportable/sharable formats to surprisingly good for multi-channel music.