, they will in the second weigh 1,210 lbs.;
in the third 1,331: in the fourth 1464 lbs.; the term remaining very
constant up to the ages of 11-12 in females, and 12-13 in males, where
it must be nearly doubled; afterwards it may be continued, and will be
found very nearly correct up to the age of 18 or 19, when the growth
proceeds very slowly. At an equality of age the male is generally
heavier than the female. Towards the age of 12 years only an
individual of each sex has the same weight. The male attains the
maximum weight at about the age of 40, and he begins to lose it very
sensibly toward 60. At 80 he loses about 13.2328 lbs., and the stature
is diminished 2.756 inches. Females attain their maximum weight at
about 50. The mean weight of a mature man is 104 lbs., and of an
average woman 94 lbs. In old age they lose about 12 or 14 lbs. Men
weigh most at 40, women at 50, and begin to lose weight at 60. The
mean weight of both sexes in old age is that which they had at 19.
When the male and female have assumed their complete development they
weigh almost exactly 20 times as much as at birth, while the stature
is about 3-1/2 times greater. Children lose weight during the first
three days after birth; at the age of a week they sensibly increase;
after one year they triple their weight; then they require six years
to double their weight, and 13 to quadruple it.
It has been computed that nearly two years' sickness is experienced by
every person before he is 70 years old, and therefore that 10 days per
annum is the average sickness of human life.
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