The bones become more porous and more brittle.
The effect of atrophy is also seen in the diminution of all functions, and in loss of weight in individual organs.

That the brain shares in the general atrophy is evident both anatomically and in function.
Mental activity is more sluggish, impressions are received with more difficulty, their accuracy may be impaired by accompanying changes in the sense organs, and the concepts formed from the impressions may differ from the usual.

The slowness of mental action and the diminution in the range of mental activity excited by impressions, and the slowness of expression, may give a false idea of the value of the judgment expressed.

The expression changes, the face becomes more impassive because the facial muscles no longer reflect the constant and ever changing impressions which the youthful sense organs convey to a youthful and active brain.

That the young should ape the old, should seek to acquire the gravity of demeanor, to restrain the quick impulse, is not of advantage.