昭和20年 (Showa 20) is 1945 in the Western calendar. Check the age and zodiac below.
Yes. Showa 20 (昭和20年 in Japanese) corresponds to 1945 in the Western calendar.
1945 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 乙酉.
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.
Showa 20 is written 昭和20年 in Japanese. It is also commonly abbreviated S20 — for example on driver's licenses and other government forms.
