I think regardless of how old someone is, they have to be willing to adapt a bit. I think that can happen to people of all ages. That being said, they also have to be ready for a relationship.
I think so many people like the idea of being with someone until they realize it is going to involve a bit of effort. Not that it shoudl always be "hard" per se, but relationships do require a lot of give and take. Someone who is all into taking causes a lot of weight to be borne by the other party. I also find the term "relationship" has many definitions