Why do many Asians seem to look so much younger than their age?

I was at the bus stop and an Asian woman who weighed 100 pounds told me she was 70 years old and worked a part time job while living with her adult son and grandkids. She had the skin of a 40 year old woman, barely any fine lines or wrinkles. And she was eating a bag of potato chips so she was not a fitness junkie. When I was 32 people told me they thought I was in high school or middle school. When I was 21, they would sell me children’s bus tickets because they thought I was 10 years old.

Why do many Asians seem to look so much younger than their age?
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