I'll be 50 on my next B'day. That makes me close enough to submit an opinion, but only old enough to vote once!
Personally, I'm not crazy about the additional stratification, but with the ever increasing volume of posts it makes it easier to filter down to the areas of primary interest. So, why not? If it isn't a big deal to create, put it out there and see what happens. If there is little interest, let it die and get rid of it.
Just curious... Is 50 special? Why 50 as the age break?