昭和15年 (Showa 15) is 1940 in the Western calendar. Check the age and zodiac below.
Yes. Showa 15 (昭和15年 in Japanese) corresponds to 1940 in the Western calendar.
1940 is the Year of the Dragon (辰（たつ） in Japanese) in the 12-year zodiac cycle. In the older 60-year sexagenary cycle (kanshi) it is 庚辰.
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.
Showa 15 is written 昭和15年 in Japanese. It is also commonly abbreviated S15 — for example on driver's licenses and other government forms.
