Ladies Perspective of Age Gap Between their Partner.  

In the age of my granpa and still in Indian villages it is preferred to have a lady elder in age for a bride the reason being that the boys are married at young age particularly in tribal and rural areas of rajasthan ,jharkhand,chattisgarh ,and youg girls are not preferred as brides for doing the chores of the house
If the boy is young and he maries a grwown up woman then the woman not only looks after all the work in the household but takes care of the upbringing of the boy who is of generallly 10-12 years of agae against 17-18 years for the girls
Puberty has nothing to do with this concepts only the workingconvinience is the criteria
shakespear had 15 years older than him woman as his wife and so had licncon
But there is aa craze in some community to go in for a youger bride than the groom even 90 years old people are marrying 17 years old
what they would be doing at the pysical level leves musch for debate and doubt
persosoanl preferences apart it is biologically necessaty for male to be 6-7 years older to the female to enjoy unpeturbes maritial bliss
All the best