I personnaly don't think age should come into it, it is an act, actors deal with this sort of thing all them time. People who see it as funny, or perverted, need to get into the real world. On the note of Aspen, she seems like a good replacement, but she does look a bit on the small side though, from what I have seen in pics. Not that this should be any problem, if she has a great voice, just something I noticed.
