I'm 51 and I built my first model airplane before I started school. An old Revell 1/72 F-101. It was a mess of glue and mis-shapen plastic, but whadda ya want from a 5 yr old? I built mostly model fighter planes for years, a few ships and cars, but as a 20 yr old newlywed I bought a Monogram Sherman Hedgehog kit and the color diorama building enclosure by Shep Paine lit a fire in me. I gave it up reluctantly after I accumulated a few rugrats. After all my kids grew up and left home, I took it up again after 25+ years.
I enjoy video games, even at my age- Call of Duty for pc is my favorite FPS- but it is no substitute for bulding armor models. I've always been creative, drawing, writing and painting, and I see modelling as an extension of that. Seems to me that if you are the creative type, you will seek some hands-on outlet for that. Writing a novel takes about the same amount of time as building and finishing a model (did me, anyhow). I thought this hobby had died out back in the 80's when all my local hobby shops closed up, and was pleasantly surprised to find that it had not only survived, but advanced exponenetially over the last 20 years.
Some young folk who enjoy creating with their hands will still, I believe, find their way to model-building. They are infinitely better suited to handle PE tool clamps. I have a new OptiVisor, but still need to master gene-splicing in order to grow that third hand that seems to be required to assemble those drechlich little demon-spawned brass torture devices . . . .