It does seem like your boyfriend has a lot on his plate, however, once every three months is legitimately not enough for the average 22 year old... and I doubt it's enough for the average 47 year old, especially if it was different at the beginning of the relationship. Would it be ok to bring this up some time? Maybe if he's not up to it you could do other things to bring you closer (cuddling, anyone?). But what you're asking for is not excessive.