If you love something, set it free. If it doesn't come back to you, it was never yours to begin with. My kids are mid/late 20s. They contact me spontaneously every couple of weeks or so (they live in different countries) and that means more to me than any response I might get by demanding they call me every day. I do think there is a bit of a male/female divide here, and sons just don't act in the same way as daughters, but you have to have faith in the strength of your own relationships and the job you have done. I would rather wait for them to call me because they want to than to sour the relationship by demanding what they don't want to give.