This is the age where most people want to settle down.

I think beyond having basic social skills - profession, similar values and shared goals take over. The average age difference in the west is also 2-3 years.

There should be avice given based on age brackets.

18-25 : Looks, fun, social proof in terms of a wide social circle, logistics, game

25 or 30-35 : Profession/education, health, similar goals and values take over