OP is suggesting we need to diversify LW group, particularly by recruiting older people.

In that sense I completely agree with the OP. My concern is that religion and rationality are not interchangeable--rationality is not a religion substitute in the sense that the act of rational thought itself doesn't give too many fuzzies. (At least, that's how it looks to people on the outside.) To clarify further: my argument is that rationality itself, not rationalist communities, is lacking in emotional appeal. Because of this, you can't always expect people looking for a belief system that will give their children comforting thoughts to pick rationality over religion.