Five-month-old baby Dong Yuhan is interested in many things. [Photo/ H Lei]

This photo is taken by my father when I was around 2 years old, and I am 23 year old now. - Shandianxia

She was four years old in this picture taken in a park in her hometown in Zhejiang Province. - Vivian Sun

This was a standard student photo at school. I was six and a half years old back then. - Wang Mengjia

It was the first day of the New Year when I was six years old. It was also the first snow I saw in my memory. My hometown was in northern Guangdong, South China and snow is rare. This photo capturing me making a snowman always brings me back to those happy days in my childhood. - Quinn