People born in Shōwa 21 are 78 years old.

Shōwa (昭和) was the era before Heisei (平成). It started on Dec 25th, 1926, following the death of the Emperor Taisho. You can read more on Wikipedia or keep browsing on this site with the following links.

Quick Year & Age Chart

Year Local Year Age Sexagenary Cycle Chinese Zodiac
1941Shōwa 1683miSnake
1942Shōwa 1782umaHorse
1943Shōwa 1881hitsujiGoat
1944Shōwa 1980saruMonkey
1945Shōwa 2079toriRooster
1946Shōwa 2178inuDog
1947Shōwa 2277iPig
1948Shōwa 2376neRat
1949Shōwa 2475ushiOx
1950Shōwa 2574toraTiger