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 If you want to know how old you are, there are a few ways to calculate it. You can use an online age calculator, which is a convenient option if you don't know your exact birth date or if you want to know how old you are in a different culture. You can also use your birthday and the current date to calculate your age, or you can ask someone else to do it for you. The age of a person can be counted differently in different cultures. This calculator is based on the most common age system. In this system, age is expressed by counting years with or without including the current year. For example, one person who is twenty years old is the same as one person who is in the twenty-first year of his/her life. In one of the traditional Chinese age systems, people are born at age 1 and the age grows up at the Traditional Chinese New Year instead of birthday. For example, if one baby was born just one day before the Traditional Chinese New Year, 2 days later, the baby will be at age 2 even th...