I'm with nfe on this.
At 38, my tastes are more extreme than in my teens. I first got into metal when I listened to Iron Maiden & Kiss at 12. I was slightly later than many of my friends getting into Thrash (seeing Anthrax & Testament in 1987 was probably the first time I really "got" it & thereafter Exodus became my absolute all time favourite band). Found early Napalm Death a bit too extreme at first (my guitar teacher taught at same school as Shane Embury), Death too (the band, not the genre).
But my tastes took a lurch to the extreme around 1990 with Obituary, Bolt Thrower, Cancer, Morbid Angel, Godflesh.
I'm fairly convinced that had Meshuggah released "Chaosphere" in 1988 as opposed to 1998 I wouldn't have liked it.
Yes, I do feel comfortably the oldest person in the room when I go to an extreme metal gig nowadays. On the flip side, when I went to see Rush last time, there were men in suits in their 50s in the audience & I would guess I was in the younger half of that crowd :lol: (a crowd which, incidentally, lifted the roof off the place when the band took the stage...)