Body Mass Index

I would like to get some opinions. At what point does a higher than optimal BMI decrease longevity, if a person has a low body fat percentage, say in the 11 to 12% range (male) is a higher body mass index always a negative? For example, would a BMI of 22 be preferable to a BMI of 25 even if all the extra weight causing the 25 BMI was muscle?