Stallie, ref your question on the first page of the thread I had to dig my old books out, but Steve got it first but his figures are essentialy correct.
Ive worked out I have a career average of 300km/hr at an average height above Earth of 17000 feet. Ignoring the more major quantum variables I am 529 nanoseconds younger than if I hadnt pursued flying.
If in the same time frame I had flown the space shuttle I would be (roughly) 3.344 seconds younger.