I think that's a long time.
Most Helpful Girl
Most Helpful Guy
To me it's not so wise to base this on time, but financial security, whether you two want to move in a home together, want to raise kids, don't mind no longer socializing as much (or at least leaving very early before all the other single people), etc.
5 years is quite long unless she intends to have a minimum number of boyfriends or has no plan to ever have kids, since her body is unlikely to bear children after a certain age.0