One of the main reasons our hands can age faster than the rest of our bodies is that they're nearly always exposed. 随着年龄的增长，我们手上的肌肉变小，脂肪垫减少，皮肤变薄. 在某些情况下，骨密度会随着时间的推移而降低. 常年暴露在阳光下加上皮肤老化，你可能会变老, almost "skeletal" like hands.