New filter in Reviews, by age

I was thinking of a need to add a new filter, by age, in reviews. I would like to be able to filter out all the reviews from kids (under 20) as we simply like quite different things. So, what do you say, adding age filters -20, 21-35, 36-50, 51-65, 66-? BTW, I was just the other day with a friend in the cinema and after 3-4 trailers I said that in 10 years there will be no other movies except for the teenagers... now, that's a scary thought!