Why do these people get married when they are young?
That's pretty common in normal people, to say nothing of famous people. According to Wiki, he was 27 and she was 23. This is too young to be married?
What is interesting to me is this idea of a "role model." News media, talk show hosts, and a wide range of people somehow believe that just because a guy is rich and famous, somehow he is better or stronger than other men, and therefore should be kept to higher moral standards, for the public good and for the children. Consequently, the guy's private life becomes a matter of public well-being. This entire thought-process is perverse in the extreme.
No, it's mythical. You're much mistaken on two points.
1. He's called a role model, because he's very successful and people (for good or ill) want to be like him. They look to him for inspiration and guidance. There's nothing necessarily wrong or perverse about that; it's actually a good thing within certain limits. In a way, he IS better or stronger than other men, in that he is a more talented golfer.
2. There is no higher moral standard. Adultery is looked down upon by most people, regardless who does it, at least in the U.S. Unless, of course, he's a Democratic president.
Edit: I'm talking physical adultery, of course. A lot of people seem to think that pron and "exotic dance" are OK for married people to view.