Just like a lot of Chinese have 2 names (A Chinese name and an English name), they also seem to have two ages! – One is calculated by standards the westerners are used to – after one year of life, you are one year old. The other one is a bit different.
Commonly known as East Asian Age Reckoning – I’ve discovered how the traditional Chinese determine age. Age begins from the time one is conceived, not born, so you are already 1 year old when you come screaming into this world. You are considered a living being from the time of conception.
Moreover, since age is incremented on the Lunar New Year rather than on a birthday, people may even be one or two years older in Asian reckoning than in the Western system!
The simplest way to put it is: your current age + 1.