Out of 10 fifty+ cyclists, how many can't keep their weight down versus how many are at their appropriately lean weight?
What do you mean by "appropriately lean weight"? I have noticed that the more I cycle the lower my goal weight becomes.
Is Peyton Manning at an appropriately lean weight? He is 2 inches taller than I, and 20 lbs heavier. How about Kobe Bryant? He is 5 inches taller than I and 7 lbs
lighter. Matty Reed (elite Triathlete)? He is Kobe's height and 25 pounds lighter than Kobe (32 pounds lighter than I).
From a cycling perspective Matty's physique would make the most sense, but personally, I would prefer to have Kobe's physique. He looks the best.
There is simply too much variation in what people consider "appropriately lean" to answer your question with any accuracy.