I agree with the starting off young, on a personal level. I give the grandkids a ride when I get a chance.
On a different note, here's a thought:
Reach out to the older ones in a way they prefer...
If you have a build thread ( I dont
) make a little placard with the link to it and something like : " Learn more about my car here :
www... "
Maybe even the links to Marco's , Vince's or Steve Plucker's" site.
Who knows, you may see somebody poking around on their I-phone, trying to find out how you put that jewel together. Maybe one in a hundred might actually ask you about it, just dont hold your breath.
Its just pretty much a given, that as a whole, society doesnt care ( because its not a necessity) about fixing things the way we had to when we were younger. Most mornings when I get up I'm thankful for that!