Studies show that the 4-5 year age gap provides the most stable relationship. Gaps more than 8 to 10 years show higher disillusionment, quarrels and disturbed interpersonal relationships, leading to separation and divorce Bigger age gaps might have worked well for some, but cannot generalise.

Why should husbands be older than wife?

Marriage generally improves life expectancy, but the age gap between a couple affects the life expectancy of men and women very differently. Marrying an older man shortens a womans lifespan, but having a younger husband reduces it even more, the study found.