Doge

So much parsing I could be a news reporter. Anyway, Thank you for your service.
AND
12 min is very different than an hour.
A Sailor is pretty close to the water. Airmen - esp. those at school are not which is why in collegiate aerobic sports the high academy dominates .
300W for an hour is not so much a strength test as a aerobic one. 12 min - is that mostly aerobic, but not the same as 1 hour which is all aerobic.
Those sleeping high will have a significant advantage for that power and that time.
Your doing that at age 47 is pretty cool, but just tells me you are talented and I don't think the age matters so much. Boston marathon runners in their 50s do better times than Lance did (running) .
It is max power that decreases faster with age, not so much hour power. That hour power will still go down, but is much less related to muscle mass which is more correlated to age. I would guess you would not be best at 20 second power over those 700 Sailors. But then, you just might be a beast.