It depends on the buyer, so I can really only speak for myself. A 302 doesn't hurt a domain's long-term reputation in the eyes of Google; it just doesn't bring any extra traffic.
I can't provide a good answer for your question about age, since I don't typically value a domain based on such criteria. In my eyes, age isn't all that important unless a domain has been developed for a long time. A lot of transfers without it ever being dropped could mark a domain that's easy to resell, but it's hard to be sure based on just that information. If there's no decent content, then indexing doesn't matter much.