I agree with them..
but nowadays i find that girls are quite mature even though they
are still young..
Age should not be a problem if you both love each other...
Like what mille and moose had said..the same level of mentility is
very important..however...mentility is not associated with
age
The most important thing is that you both can click and have the
chemistry...
as long as you are happy with each other..why be bother by the age
gap.. 
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I don't know how you do what you do, i'm so in love with you, it
just keeps getting better, i wanna spend the rest of my life, with
you by my side, forever and ever. Every little thing that you do,
baby i'm so in love with you