The hopeless romantics will tell you that age is just a number in love. The realists will tell you that age is not just a number and that limits do exist. All is fair in love compared to war because love is the battle of the sexes. Generally, men married younger women. This was in response to natural as well as social orders.
The modern world ate into the patriarchal order that ruled the world where women were subservient to men. In Kenya, this is slowly changing as women flex their muscles.