Interesting question. I'm 59, and started course skiing in my early 30's. It had been a few years since I skied a pb, but occasionally have been clearing a 35 and struggling into 38 for the last several seasons. Have taken pro lessons a few times - huge help.
This year has been better than ever, regularly clearing 35's, and getting deep into 38 often. Credit to having friends that are as committed (or more so) as you are to the sport. Without getting out there often, there's not enough time to develop the skills needed to progress at some level.