My grandfather remarried in his 90s...
My father in law found the love of his life in his 60s... and they decided to be swingers.
I have a hard time believing that age (or relationship style) is necessarily a deal-breaker for finding new love.
I think attitude is a much bigger part of it.
The whole believing something is possible makes it possible but believing something is impossible creates a lack of effort to make it happen concept.
"Love As Thou Wilt"