Going back to the US weight and stature for age charts.

Mary,
The 17 y.o. boy and 15 y.o. girl are both at 37 and 40 percentile (compared to average)

Bob,
WHAT THE HELL WERE THEY FEEDING HIM? At age 15 (high side) he was well off the chart for weight and at 96 percentile for height!

The 11 y.o. young lady I'd like to have sail this boat is at the 80 percentile for weight (100 pounds)