Isn't the combined type the most common, or has that type gone away? I find that people that are hyperactive tend to be more impulsive, and if I am not mistaken

Isn't the combined type the most common, or has that type gone away? I find that people that are hyperactive tend to be more impulsive, and if I am not mistaken, impulsivity is the strongest correlated factor in determining longevity in humans. However, I could be wrong about the levels of impulsivity being different. That's just conjecture on my part.