他虽然头发已经花白，但精神一点也不显得衰老。

Tā suīrán tóufa yǐjīng huābái, dàn jīngshén yìdiǎn yě bù xiǎnde shuāilǎo.

Although his hair is already gray, he doesn’t seem old in spirit at all.

适当运动和健康饮食可以在一定程度上延缓皮肤衰老。

Shìdàng yùndòng hé jiànkāng yǐnshí kěyǐ zài yídìng chéngdù shàng yánhuǎn pífū shuāilǎo.

Proper exercise and a healthy diet can to some extent delay skin aging.

科学家一直在研究如何减缓大脑的衰老过程。

Kēxuéjiā yìzhí zài yánjiū rúhé jiǎnhuǎn dànǎo de shuāilǎo guòchéng.

Scientists have been studying how to slow down the aging process of the brain.