re: How old is it too old to kiss your son?

Never too old.

I have three boys that know that their dad, despite his many faults, loves them. Aside from just "being there" at key times, showing your child appropriate affection is another way for them to know you love them.

As other have said and I share as well, I did not grow up in an affectionate home. My parents were great, but I made a conscious decision, given how I grew up, to chart a different path with my kids and hug/kiss them from the time they were born.