would it be prudent to use max take off power on a 25000 hr engine vs a 3500 hr one....no...but then again...
TOGA power on a 25000 hour engine (which has had it's life extended by using Flex) is perfectly acceptable.
@ Johns7022/SSG - I don't think you understand "creep" of hot turbine blades.
Have you ever been curious why Full Take Off power is limited to 5 mins (or 10 mins with Engine Failure) but climb / cruise power can be set with no time restriction?