Firstly__the question itself has been framed incorrectly.
It should be : Is it advisable for a man to marry a woman younger to him?
My answer; YES!! Why not. By all means he can marry legally.
Aspects to be considered are: Physiological compatibility and mental wavelength. On...
It is all in the mind. At an intellectual level it won't make any difference, however, if the age gap is too much for physical compatibility, then it can create problems and cause frustation.