I'm a police officer, and every once in a while on this job you get an impromptu fitness test. The other day, I was involved in a foot pursuit of a robbery suspect. Chases like this normally last 30 seconds or so because help arrives almost instantly. Unfortunately, this time, I was on my own. I chased this kid (20 years old/5'11"/160 lbs) down in a distance of over 3/10 of a mile and had plenty of gas left to wrestle him into a pair of handcuffs.
I'm 37, 5'10", 190 lbs., plus about 25 lbs of gear on my belt. You just can't put a price on being in shape. I hope all of you "old guys" can appreciate this story.