Age wise no 44 is not too old, my guess is a lot of escorts would pick mid forties as their ideal age range for clients.
As regards not finding other women attractive, I don't necessarily think so, not every woman is a supermodel does that mean that you couldn't find a woman who is not a supermodel attractive?
If you're just starting to look for a new relationship after a long term relationship has ended then meeting new women who are escorts might also make it easier for you to actually take the step of meeting someone outside escorts.
Just remember you're not going to have that relationship with an escort, its a one off encounter.