Best answer: 100 years. Century, refers to the unit of calculating the age, a century represents 100 years, usually refers to the continuous 100 years and ten years sharing digits. This odd-numbered chronology comes from the post-Jesus era, in which one year usually means “Year of the Lord”, so the first century is from the first year to the 100 years, and the 20th century is from the 1901 to the 2000 years.

1, century, refers to the unit of calculating the age, a century represents 100 years, usually refers to the continuous one hundred years and ten shared digits. This odd-numbered chronology comes from the post-Jesus era, in which one year usually means “Year of the Lord”, so the first century is from the first year to the 100 years, and the 20th century is from the 1901 to the 2000 years.

2. Since the starting point of the year of AD is the year of AD, and the first century is the period from 0′ s to 90′ s, the calculation of binding digit age starts from 0′ s. The’ 0′ s is a ten-year position, accounting for only nine years. The concise calculation year from the 0′ s to the present 2020′ s, we live in two types, namely, the sorting digits of the era year and the whole century.