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Sonic Foundry's Sound Forge can do it. It's much easier to make a voice more masculine or feminine than it is to make it sound like an older version of the same voice, since the enunciation will be the same in the altered version and it rarely is in a genuine aged voice, but (for example, with a man's voice) if you raise the pitch slightly (this is where you need the good audio editor, because most cheap ones will raise the pitch by speeding up the recording--you want one that will not speed up the recording to raise the pitch) and then add a very little bit of warble into the voice you can make it sound older.
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