Why can't boys remember forever too?

In a conversation Ollie had this morning with Hubby, she asked him, "why do girls remember forever and you forget? Why can't you remember forever too." I don't know what prompted this conversation, but I thought it was intriguing that she recognized something that many women have often found to be the case. Not that this is true, but sometimes it seems as if what is important for us girls to remember is not that important for our men to remember. At 4 she is wise beyond her years.