Here's a cool table of height and weight distributions for American men and women:
http://www.census.gov/compendia/stat...es/12s0209.pdf
As a male in the 50-59 age range, my height of 6-0 is taller than 81 percent of my peers (and probably more like 85 percent since I'm half an inch taller than 6-0). My weight of about 184 pounds is more than about 37 percent of my peers. I am apparently a rangy 50-something.
The average man and woman by decade are as follows. (I'm not bothering with interpolation and am just eyeballing, so the exact figures may vary slightly.)
Men
Age 20-29 - 5-9.5 and 174 pounds
Age 30-39 - 5-9.7 and 190 pounds
Age 40-49 - 5-9.7 and 194 pounds
Age 50-59 - 5-9.7 and 196 pounds
Age 60-69 - 5-9.0 and 197 pounds
Age 70-79 - 5-8.3 and 190 pounds
Women
Age 20-29 - 5-4.7 and 150 pounds
Age 30-39 - 5-4.3 and 159 pounds
Age 40-49 - 5-4.3 and 160 pounds
Age 50-59 - 5-3.9 and 160 pounds
Age 60-69 - 5-3.8 and 163 pounds
Age 70-79 - 5-2.8 and 157 pounds
For men over the age of 40, the difference between 180 pounds and 210 pounds is a third of the population. You weigh more than about one-third of the population at 180, and you weigh more than about two-thirds of the population at 210.