I'm 32, so pretty close to the 20-30 age group
I've told my story before, I think there's been a few threads over the years similar to this one. Fortunately for me, my dad has always been a car guy. The 'trick' was taking me to car shows and occasionally the track. In my teens/20's, I was more interested in sports (what my friends were into), but still enjoyed cars. I had zero technical ability back then. It wasn't until a few years ago I rediscovered the old Camaro that had lingered around the garage during my childhood. My dad and I restored it, learned a tremendous amount along the way (insert CRG plug here!). Wouldn't trade it for the world. Now I refuse to buy a new vehicle as a daily driver, I'm finding enjoyment in seeing how long I can keep my old Explorer running (by doing my own service on it). My friends laugh at my wheels, but I take pride in keeping it running. Anyone car buy a new, reliable car. Takes someone skilled to keep an old one going down the road.
Common thread seems to be getting kids engaged at a young age, whether it be car shows, taking them for a ride, etc. Maybe next time you take your kid to a show, make them bring a few friends
Don't rip too much on the Fast & Furious movies, they've starred some pretty sweet old iron.