Alex Kingston is 48 yeah (though srsly HOW?!) but I don't think we know how old River is. I half expect her to have a kind of longer life than usual - she does come from the same era as Liz X who we know had Science for Long Life and while she's the queen and lived, apparently, thousands of years, we've also met other human characters in the Whoniverse we are quite long-lived from the future. So I guess I wouldn't be surprised to discover River was like, 200 or something either. Though I kind of doubt it'll even be a plot point.
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Alex Kingston is 48 yeah (though srsly HOW?!) but I don't think we know how old River is. I half expect her to have a kind of longer life than usual - she does come from the same era as Liz X who we know had Science for Long Life and while she's the queen and lived, apparently, thousands of years, we've also met other human characters in the Whoniverse we are quite long-lived from the future. So I guess I wouldn't be surprised to discover River was like, 200 or something either. Though I kind of doubt it'll even be a plot point.