Nope, maturity and experience lie solely within the individual. Of my 7 girlfriends, 6 were younger, which is odd considering I very openly want and love older women. In fact, my best relationship of the 7 was with a girl 3 years younger!
You'll meet people in their 40s, 50s, etc, who still act 16 because they never had to learn, never had to mature. You'll meet people that are 13 that are already saving up for college and discuss philosophy.