How old are the different age stages of life?

People of all ages like to quote an old saying, as the saying goes, ten years old is not troublesome; At the age of twenty, I don't regret it; At the age of thirty, you stood firm; When you are forty years old, you won't be surprised; When you are fifty years old, you know your destiny; At sixty, you are smooth; When you are seventy, you are old; When you are eighty years old, you are very old.

The latest classification standard:

1, childhood. 0-6 years old (one year old, the same below) (1) 0-3 Zhou Yue in infancy; (2) Childhood 4 Zhou Yue-2 or 5 years old; (3) After 2 or 5 years old in early childhood-6 years old; 2. Teenagers. 7 years old-17 years old. (1) Enlightenment age 7-10; (2) Retrograde period: 1 1 year-old-14 years old; (3) The growth period is 15 years old-17 years old.

3. Youth. 18-40 years old. (1) adolescence 18-28 years old; (2) The mature period is 29-40 years old;

4. Middle age. 4 1-65 years old. (1) maturity 4 1-48 years old; (2) The stable period is 49-55 years old; (3) The adjustment period is 56-65 years old;

5. Old age. After 66 years old. (1)67-72 years old; (2) 73-84 years old; (3) After the age of 85.