Looks 90's to me. Early 90's.
I could be wrong -- that fabric may have been something bought up cheap on sale, and the bus is only 10 years old. Or it may have been ahead of its time (it is a little Bugle Boy-esque) and the bus is actually 30 years old. Or they may have reupholstered the 70's-era seats, and the bus is 40 years old. Who knows? Buses all look like people who get to a certain stage of decrepitude and go into a holding pattern.
All I can say is, the moment I saw this, one familiar tune popped into my head: