Yes, they need to stay moral, just like married people (no matter how old we get) need to stay moral.
One thing older singles need to change, as compared to the younger singles is stop relying on a system that is not working for them (regardless of the reason or unfair-ness of it) as start taking the serious matter of finding a partner on their own. Nothing stopped them from finding a job, nothing should stop them from finding a spouse.
In many ways, older singles are better suited to make (and see thru) their own decisions, than are the youngsters. The only thing you have to lose is your single-hood.
Don’t just sit there.. go get what’s rightfully yours!