I don't understand what you are trying to ask. Is it as alvao said? Or is it how long I have loved someone?
I think that one is not mature enough to love a girl until at least the age of 18.Anything prior to that is merely "puppy love" or just lust.That of course is a generalization but 18 is usually the age of the beginnings of maturity.
These kinda threads have got to stop. If you're going to ask questions like this, at least use understandable English.