When you took part in the Royal Tournament that celebrated the 1st 50 years of the RAF, and we are only 4 years away from the service centenary.
When the very boyish client who commissions you to carry out some architectural design work has a wing commander's grow bag upstairs and it wasnt his dad's.
When you have been out longer than you were in.
When you can remember how to service a GPI 6 but you cant remember which client you spoke to yesterday. Even worse, you dont care........