昭和54年 (Showa 54) is 1979 in the Western calendar. Check the age and zodiac below.
Yes. Showa 54 (昭和54年 in Japanese) corresponds to 1979 in the Western calendar.
1979 is the Year of the Goat (未（ひつじ） in Japanese) in the 12-year zodiac cycle. In the older 60-year sexagenary cycle (kanshi) it is 己未.
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 54 is written 昭和54年 in Japanese. It is also commonly abbreviated S54 — for example on driver's licenses and other government forms.
