I'm with you, Josann. I'm 56.
As Gironda once indicated, I did achieve my best condition over 50. In fact, at 54 when all my training and diet know-how came to a head. And still holding. Strength can improve for longer than I originally thought, but care and common sense needs to come to the fore regarding joints, soft tissues, and recovery.
At present the skin is a bit different than when younger but not sagging. Then again, my weight has stayed in the same range for over 10-15 years. I think that matters.
I made adjustments in the way I perform reps that helped greatly--the biggest being to remove Stretch Reflex altogether and use brief pauses between reps (this reduces the damaging effects of the 'cheat' rebound, which is all SR is) . Also hard squatting and deadlifting no more than 1 day per week, and 2-day and 3-day programs really work, and help strength and recovery. Also found that Ibuprofen right before bed after that day's heavy session helps clear inflammation a lot; I hypothesize this is due to the sleep + ibuprofen factor.
Good to see this talk going on.