Usually most of scenarios younger girls are connected to older boys even in olden days some of the parents perform marraige of their girl child to a oldest person for money but no older women is allowed to marry a young guy or even not to fell in love with young boys it's completely a trash even old women can fell in love with young boys n even can get married most famous persons has married to younger n older persons n are living happily so there is no issue in younger to older
Not sure your point here, Surya.
First it's only sin if you believe in such a thing and no that is not a knock at people that do, just not my thing.
Nowadays there (in the UK) are plenty of couples where there is an age imbalance, a good friend is 15 years older than his wife and another friend I have is 25 years younger than his wife. Even with my Catholic head on, neither are sinning.
So long as both parties are of legal age and consenting, I don't see any harm in either there being large age gaps or dynamics that explore it.