Not saying that at all. Even if Cruise is starting to look older, do you really think he can't get laid? But at some point there is going to be some fall off. I'm sure there is a wide variation from individual to individual as to when that occurs, due to genetic factors, lifestyle, how well you take care of yourself, etc. But I've noticed for a lot of men that point seems to come not at 50, but rather somewhere in the mid 50s.
As an example of variation, I recall Atom Smasher saying that he looked about 35 when he was actually 57. Says he has a baby face. I think I look fairly young for my age, but wow I've developed some aches and pains, mainly in my joints. One shoulder, one knee, and now both elbows give me trouble intermittently. But I'm happy to deal with that rather than something like cancer, lupus, diabetes, or coronary artery disease.