If girl is elder than boy its effacted ther life?

Age difference CAN be an issue in relationships, in any relationship.

A) Society generally wants to see couples where the boy's chronological age is greater than the chronological age of the girl. And, in this regard, age difference CAN be an issue if the girl is older than the boy.

B) However, chronological age is less important than maturity because, for example, there are 30 years old people with the maturity of a 20 year old, and 20 year old people with the maturity of a 30 year old.