Is it alright for a woman to love n marry a man fourteen years younger to her. Reg reproductivty libido as whn she turns 60 he wil be 46. N sex drive?

Social norms. There are no medical issues in this question. Men and women can remain sexually active beyond their 90's.
It depends. This depends very much on the preferences of the couple. Even those who are closer to each other in age have no guarantees. You may face some strange looks from others who disagree, but what will get you through (or not) is the quality of your relationship. Good luck to you.