For example, people can't make false claims about their age, and it is refreshing to know the age of others and their view on their opinions. It never quite fails to amaze me of the broad variety of opinions in different age levels.
Some people may argue that it is a safety haphazard, but if someone has a issue they can lie about his/her age a little bit, but for the most part most people already make a lot of information public, and I believe knowing others ages is amazing especially how Debate.Org coaxes you to submit your real age for your best interest. Hehe
I'm sure that many users on this Site are not as old as they claim to be. I, for instance, am not as old as my account currently says I am.
If users were required to insert their real ages, there would be ageist discrimination against younger (and perhaps older) users.