I'm nearly 62. I've enjoyed comparing my various routes on Strava with different bikes (road, fat, MTB suspension hard tail). The hills are really key because the algorithms for weight-speed and output are more accurate when climbing. Anyway, I can roll for 2 hours at 200+ watts and 4 hours at 150 watts. I've gone 1 hour at 234 watts. I use a heart rate meter so my calcs are based on that as well as age, weight, heart rate, speed, ascent, bike weight, time, are all part of the calcs.
I've also used the bike calculator app and that is very interesting to consider. I'm I fast? Hell if I know. I rode the STP on a fat-bike: 205 miles, average speed of 12 mph, bike weighed just under 40 pounds loaded out. I can cruise 4+hours on my road bikes on the hoods, a bit stretched out, at 16 mph solo. There's a huge difference in short term power and endurance power. I will say that my goal is 3 watts per kg and I'm within 40..... Lose 40 pounds or add 40 watts LOL.
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Last edited by Jseis; 08-07-16 at 11:19 PM.