I started MTBing when I was 20, after coming from a BMX and then road background. It was a combination of being a cyclist, and loving nature and bushwalking and wanting to be out there and explore and see more of the bush near where I live. I'm 53 now.
Would I take up MTB now if I was 20? For sure. It looks nuts, those guys are out there on long travel carbon bikes with 160mm travel and 2.6" tyres throwing down mad stylee moves and hanging out at the bike parks with their bikes slung over the tailgate of their trucks and chugging craft beer and building jumps and wow man.
Would I take up MTB now at the age of 53? Dunno. Probably not if I wasn't already a bike person. Looking at it now it's all a bit of a wank. Though I would probably like the idea of bike packing and gravel riding to get out exploring, which I do as well.
I look at MTB when I was out of uni and had the means to get into it. Bikes looked different, they had an identity, you could add anodised widgets and it was all fresh and fun. The industry was dudes in their shed building stuff and companies like Hope, King, Paul Components etc were things to drool over. Companies like Mountain Cycle and Foes made exotic stuff that I aspired to.
I look at it now and the bikes all look the same, the marketing departments seem to have taken over. Companies have been killed off by big players.
But, it's hypothetical because I am 53 and I do ride. The industry might be a wank but the bikes are fun and riding is still fun and I'm bloody glad I do it.
Grumps