I was led to believe by all the TV sitcoms of the 80s that I'd wake up one day in my 40s, everything would feel totally different, and then I'd take long walks and be thoughtful about stuff, buy an overpriced motorcycle and dye my hair badly. I'm solidly into my 40s and I just worry about climate collapse, becoming homeless, and my partner's health. I honestly wish that becoming less attractive was something worth worrying about.
Chronologically, I'm pretty damn old.
The pop culture predicted "mid-life crisis" never showed up. Sure, I've been struggling with an existential crisis and coming to grips with mortality since before my teenage years, but nothing changed as I got older.
Maybe it's different for "scored the winning touchdown one time in high school" bro-bros that burn out and/or remained fixated on a very specific age of their life to the point that they can't stop obsessing about people that specific age, up to and including to the point of
. After all, a big part of the 80s/90s "mid-life crisis" was a portrayal of aging men creeping on teenagers and presenting it as if was funny. 
I can't believe I used to enjoy Revenge of the Nerds