明治12年 (Meiji 12) is 1879 in the Western calendar. Check the age and zodiac below.
Yes. Meiji 12 (明治12年 in Japanese) corresponds to 1879 in the Western calendar.
1879 is the Year of the Rabbit (卯(う) in Japanese) in the 12-year zodiac cycle. In the older 60-year sexagenary cycle (kanshi) it is 己卯.
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.
Meiji 12 is written 明治12年 in Japanese. It is also commonly abbreviated M12 — for example on driver's licenses and other government forms.