衰老

liǎng nián méi jiàn tā shuāi lǎo xǔ duō

两年没见，他衰老许多。

He has obviously aged and weakened since I last saw him two years ago.

shài tài yáng guò duō huì shǐ pí fū shuāi lǎo

晒太阳过多会使皮肤衰老。

Too much sun ages the skin.

suí zhe yī tiān tiān shuāi lǎo wǒ men de shēn tǐ xiāo hào rè liàng de gōng néng zhú jiàn jiǎn ruò

随着一天天衰老，我们的身体消耗热量的功能逐渐减弱。

As we get older, our bodies become less efficient at burning up calories.