This rule applies to a girl marrying an older man. Finally, there is really no rule about “optimal age gap in marriage”. Age difference of one to five years seems to be optimal for most couples, the female spouse being younger.

Is 5 years a big age gap for marriage?

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.