Apparently they have been "together" for a long time.

I remember meeting him and his then wife at a party in Cabo years ago. His then wife was drinking heavily and Aldrin was sober. Ironically, he explained to me all the pitfalls of being sober and the fact he was an alcoholic. Seemed to be a really nice and quite willing to talk to me all the while with his grip on a Mexican bottle of Pepsi.

I don't think the age difference is just in Hollywood. I see it everywhere-especially when there is the appearance of a power unbalance. Moreover, women tend to keep better care of themselves over the years then men do-both mentally and physically. (How's that for an implied bias from me ?)