Too old to be tugged in?

I have a son from my previous relationship. He is 13 years old now. Sometimes he still wants to tucked in bed. Also sometimes when we are watching a movie, he comes next to me and put my hand over his shoulder.

My fiancee comments this time to time, saying that maybe he is a bit too old to act like a little baby. I'm not sure how to react on it. I don't mind about these things too much. Sure I think about it time to time, but then again is there something wrong about it.

My own father is passed away already, but one thing I remember about him, was that he hugged us kids, no matter the age. That is something I want to pass down as well.

edit: changed the spelling with tucked in, English isn't my language, so I might have errors in language