大正10年 (Taisho 10) is 1921 in the Western calendar. Check the age and zodiac below.
Yes. Taisho 10 (大正10年 in Japanese) corresponds to 1921 in the Western calendar.
1921 is the Year of the Rooster (酉（とり） in Japanese) in the 12-year zodiac cycle. In the older 60-year sexagenary cycle (kanshi) it is 辛酉.
It depends on whether they have had their birthday yet this year. The box near the top of this page calculates both possible ages automatically from today's date — the lower number is their age before their birthday, the higher number is their age after.
Taisho 10 is written 大正10年 in Japanese. It is also commonly abbreviated T10 — for example on driver's licenses and other government forms.
