["When my nephew's car broke down and I loaned him my car, I know that he'll be careful with it.", 'Well at least you can trust him to be careful.  I dont think I would be able to trust my nephew as he is only 18 and not very responsible yet.', 'Yeah, 18 is an inherently irresponsible time, mine is 24 and getting married soon so that makes a lot of difference.']
Yes its amazing how much of  a difference a few years can make in age.  It seems that males take quite awile long to mature than females.
My nephew's car broke down last month and he needs a car to get to work.  His money is tight because he's getting married in the fall and can't really afford to rent a car for a week and a half, so I loaned him mine.  I know he'll take care of it.