Al ( and all) I've been screaming this for the longest. But who am I? ;)
Frequenting forums other than this one, You read time after time how these "kids" (I'm also a graying 58) bring their Gundam or Star wars starship to a local meeting only to be scoffed at. And what do they do? They go home and never come back. While Regionals and Nationals have a good mix of other than military kits from the young'uns, IMO the local level is where the problem is. The oldsters that sit there and discuss the 50th Bf-109 on the table to death and scoff at an A-Wing are the problem. Whether one thinks it's stupid or not, they need to give it a fair shake, even if one has to act.
There is a resurgence of some of the young. As Robin mentioned there are physical models that go with the Tank online game. For those that remember the old Dungeons and Dragons or Ral Partha, there is a new miniatures war game based on WW2, where a big part of it that has tanks and planes that must be put together and painted. Then there are the sci-fi and fantasy minis and regular sized kits that is very popular out there. I'm not even included the "garage kits", which are probably the majority of the figures seen in that category. Some are even repainted the pre painted models. The next logical step is picking up a kit to be built and painted. So they are out there.
To rehash - local clubs, take a look at what image you portraying. If a kid comes in with Gundam, a Mech or Ma.K; even if you're pretending, treat that Ma.K as if it was a Panther or Sherman... Ok rant mode over. ;)