No. If anything I got into heavier stuff as I grow older..I found tonnes of obscure or lesser known bands which I had missed out in my teens (as it wasn't easy or cheap to listen to my kind of music back then). I have had these same thoughts too that most people seem to like mellow stuff now but I keep going back to the early to mid 80s thrash/heavy metal that I truly love.
It's weird though that my 3 yr old son is also listening to some of that stuff now along with Little Baby Bum videos :s
Any particular band(s) that you want to see live but hasn't been possible?