I guess you have to be in the right place. I'm 28, and the most junior person on my team by at least 5 years in age and 8 in experience. It is great, since I have so many people to learn from.
I'm 28 and I wish I were the most junior on the dev team. Being a "lead" developer is fun, but I wish I had more people who I can actively learn from just by being around.
There are plenty of places where the "senior" developers have more than 5-6 years of experience.