And men were in jeans, and could wear their hair long too.

So jeans and T-shirts are just fine.

The man's jeans and T-shirts are stylish

In the 1920s, Swiss psychologist Jean piaget proposed that children's cognitive abilities unfold naturally,like the blooming of a flower, almost independent of what else is happening in their lives.

However, the "screen time" hypothesis, advanced by researchers such as Jean Twenge, is that electronic devices and excessive time spent online may have reversed these trends in recent years, causing problems for young people's psychological health.