"IME weight training gives us geezers a big leg up. "
Working on that this year. More upper body stuff than lower, 'cause I don't want to be sore the next day for cycling and I don't have the machinery to do leg presses or weighted squats. I can ride 70 hilly miles, no problem. But 10 unweighted squats and I am sore the next morning.
So, if I really work at it, how much can I reasonably expect to raise my FTP? When I read accounts of folks who went from 120 to 350 in a couple of weeks, I don't believe them.