I'm 54. I started my journey back to fitness Mar 21, 2014. I've lost about 30#, ridden a lot of miles, worked pretty hard. I'm trying to work up to a < 60 minute 25 mile TT.
This morning (temp 83, dewpoint 72, no wind to speak of) I did this:
I'm the two headed guy at the top of the heap. I was in better form (and in much nicer, dryer, cooler conditions) last Wed and about 45 seconds faster, but Strava didn't log it correctly. I was about 90% today, knew I couldn't climb as well, but figured I could probably crack the code on this rolling 9 mile segment anyway, so gave it a try. The only thing to be said for a 72 deg dewpoint is that at least it doesn't dry you out!
Keep turning those pedals!