Being that the age group ranged from 21 to 51 and there is no raw data presented in the article, I'm thinking there could be a corrilation with the younger guys being more lean and more prone to PE and older guys having a higher BMI and having more "dick control" as Eddie Murphy calls it. I know for me personally over the years, I have been able to last longer with the more experience I have.
One other possibility could be that the older/higher BMI guys have been in monogamous relationships longer and are more comfortable/desensitized as oppose to the younger guys who are getting multiple new exciting women.
This is merely an observation of mine after reading the study.
I used to study statistics and I hate when a study doesn't show you the raw data. I am always skeptical of any studies claims. Food for thought though.
