Apron Strings- Who should cut them off?

We all know at least one person who can be categorized as a "mama's boy."  I have a very good friend who loves being one and he is 52 years old.  But what exactly are apron strings and who should cut them off?  Should it be the adult son, his wife, his mother, anyone?    Or do they need cutting at all?  What are your thoughts?

A twist in in-law news...a mother-in-law gets the role reversed on her

Normally, it is a mother-in-law that we hear in the news taking advantage of her daughter-in-law, however, in this story, the roles have been changed.  Read  below

http://www.youtube.com/watch?v=uEGJjjQYbjA