We are all in our late 40's early 50's, and I have never had a relationship that lasted longer than four-five years and they have been together over 20, so they also have more confidence than I that this can work. And they have a successful loving relationship from what I can see and both seem/ say they are interested in a lifelong commitment which is also what I want but have a very low expectation of ever having. That said I sometimes feel I am the weakest link in my lack of faith in others. I have questioned them at length on why they want this. They both say because it feels right. As this is my first poly experience that is " serious" It makes me wonder how much I have to adjust my mono-neediness.