I gotcha. Based on other posts since I started the thread, I gathered that the average person would really have no idea. I didn't consider that when I posted the question. But after having realized that, the results are still interesting although I don't think they necessarily pertain to the stated question.
I am not sure if mine has slowed or not. I ran at least 3 miles a day, every day, from age 12-17. I stayed active when I was 18, and played soccer year round when I was 19 & 20. I was inactive for 7 months after turned 21, then started to diet and lift seriously. I wasn't eating nearly as much during the 7 inactive months, so of course I didn't gain. I just realized that I don't have a good answer to this question. Shit, maybe I'll be able to answer when I'm old like Eric.