Those charts are TARGET weights. Actuals are closer to 75 for men / 65 wowen. Don't usually quote Wiki; but this is based on captured data not charts that are desired numbers from the medical profession.

http://en.wikipedia.org/wiki/Average_weight

My workes in this area and states that these charts are out of date and form a "desired growth path that is out of date".

Note the dates on the linked page; US data is as old as your charts, I'd bet if recorded/,measured now the numbers weights would be higher.