Baby you can drive my car

The car is in the garage for a service and I'm offered a swanky new(ish) 'courtesy' car to use in the meantime.

I'm about to set off and I check through the insurance document that I signed .....  as you do.  Don't you?

I discover to my horror, that I can't drive it.  I'm too old.  

Luckily my young wife is free to drive and I move to the passenger seat.  

Growing up, I was often (technically) too young to do something.  This is the first time I've ever been too old to do something.  It really is all down hill from now.