Old-soul
This native English expression is about younger people who are very mature for their age. It’s not that they act like old people, they just seem wise for their age. This is also a positive stereotype. Do you have any young friends who are old souls?
There is also a word for older people who seem younger. Young at heart. This is not the opposite of an old soul. People who are young at heart keep their child-like sense of happiness and youthful spirit. They are playful and fun, and they are kind to people.
A lot of people get more and more bitter as they age. It seems like they give up on having a happy life. At some point they are just watching the news on TV and waiting to die. People who are young at heart resist that decline. They want to live and be happy, no matter what age they are.
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