I'm 38, and started riding again about two years ago. Riding at this age isn't for everyone. Between kids, work, housework, and other shit, I dont get to ride as much as i want, and progression is slower than when I was 20.
My reactions are slower, so crashes are a lot harder, and healing takes a lot longer.
I went through a time last year where I got like 3 concussions in a 6 month period, and started to wonder if it was worth it. I love riding my bike, and I love that feeling when I get a really good pump and it feels like slow motion when the bike is in the air, but I hate it more when I wake up in the bottom of a bowl and my kids are standing over me trying to figure out if I'm dead or not.
Or that feeling when I get off work all excited to ride, so i haul ass for a few hours getting kids picked up/dropped off, getting the lawn mowed, dinner cooked, kids dropped off/picked up, get all my shit taken care of and as soon as I get to the skatepark and get my bike out, it starts raining.
So it's all good to look at DMC and Moliterno and realize you can if you want to, but the only person who knows if its worth it is you. I love it, and will ride as long as I can, but I don't know that I would recommend it.
TL;DR; I'm an emo fuckface.