"Being retired from Biking...isn't that kinda like being retired from recess?" Stephen Colbert asked of Lance Armstrong
Mostly younger 20s some older and a few older teenagers.. My sister rides occasionally, not very often though. Thats all in my fam.
Another vote for dragging the trainer outside if you can.
Check out clubs in your area, silver. They may or may not be your and the Mr's thing, but some of them do run youth programmes, especially clubs geared more toward racing.
Drink coffee and do stupid things faster with more energy.
Silver, FYI, we belong to a riding club, which while mostly adults, offers family memberships, and kids do come out, especially on flatter rides and on tandems. Usually parents call each other and plan a day when they will all bring their kids so the kids will have peers around, and then they'll ride in a group of families.
I do believe they have groups for young men interested in racing (juniors they are called) so you could also call your local 'pro-shop' to see if such a program might suit silverson.