I'm no scientist, and I don't know a whole lot about pressure systems, but I've always found that my beers do better when in a keg. So, carbonation may not help them age better, but I do think the pressure does.
I typically rack to a keg and then hook it up to my CO2 at 12-15psi. Within a few weeks, it's usually tasting great. After a month, it tastes better. When I bottle, it takes twice as long to get to that level.