Here is the difference between Men and Women at age 25. A couple who have been dating for 6 months walk by another couple who is married about the same age and pushing the stroller with their 8 month old.

The woman thinks, "Someday that will be me" and smiles
The man thinks, "Thank God that isn't me" and then continues to think about either beer, football, chicken wings or supermodels, or some combination thereof.

I write this not to unleash my inner Tim Allen, I write this because as I grow older and mellow and move away from my inner 25 year old, I realize that just like there is the 8 year old part of me that will alway think that Swords and flamethrowers are cool, there is a part of me that will always be 25.