Great Topic!
I have been treated differently on numerious occasions. I am currently twenty and have had Platinum on AA for the last four years and Gold for three years before that.
A couple of years it was worse than it is now. I used to always be asked to see my ticket when using the First Class line. The Admirals Club was particularly difficult with me and I have sometimes been asked for photo ID to prove that I am who I say I am.
I have to say that being young and having status has never helped me. I have never had the rules bent because I had status and was young. It seems that the general the feeling is of resentment.
I have been asked at immigration and customs Why I travel so much? The responce has been I study international relations and that seemed to statisfy them. Had they known that I have a South African passport as well as US they would have been even more shocked.
Age is certainly a factor in the way that I am treated and Iook about my age or a little older