This isn't unique to escorts. People do it all the time! Women probably more then men. Again there are beliefs that are hard to overcome in our society today. Beauty is very much equated to youth.
So in an industry where beauty is paramount, I can understand why the stated age may not be the lady's real age.
I'm not condoning or condemning. I must say that as a result, I always expect that a few years have been taken off, when I'm reading a lady's profile. I would be upset however, if the mileage was rolled back more than 10 years! (As thats probably too misleading in my book).
And I won't pretend that age doesn't matter. One of the things I look at when choosing an escort is her stated age. So I guess this cuts both ways.
"Don't be reckless with other peoples hearts. Don't put up with people who are reckless with yours"