If your relationship with your saddle goes as mine has, then age will be your main factor. I got a new (to me) bike that had this skinny little saddle on it that I rode and rode and after about nine years it got to hurting too much. The aluminum frame didn't help being so stiff and all. But before I turned 50 or so I could ride on anything people called a saddle. Now I have a brooks b17 and it was like $80 when I got it, they're more now. Its not even 'perfect' but acceptable. I have found that the more you ride the easier it is to sit on some of these. The muscles you use to ride, some of them are what you sit on. Its a real catch 22 to try to get going tho.
Good luck.