If a provider has a preference for seeing someone older then that is fine. Im a younger guy so I'm disappointed to not even get an opportunity in those cases but I can totally understand why some providers impose those restrictions. Just as we hobbyists are looking for a certain experience I'm sure a lot of providers want the same thing.
Of course as a younger gentleman I wish they would change their minds, but it all boils down to maintaining that comfort level in our hobby. When I made my first post in the introduction boards, Nicolet wrote "Welcome! Research, be safe, and have FUN!" If seeing a mature man provides that feeling of fun and (most importantly) safety more consistentley than us younger folks then I can air no grievances regarding their decision. Ill just have to hope they have a change of heart