The 90's sucked, Gulf-I plus post cold-war recession and drawdown, I stayed away from aviation until late in the decade.
Picked up late 90's with the economy. Tanked after 9/11, then a series of events kept it up and down until 2012 when it started to pick up again. Some of that was age 65, which is pretty much not happening again. Some was also lingering necessary shake-out from de-regulation, also not happening again.
Things were going pretty good 2015 - 2020, especially near the end.