明治20年 (Meiji 20) is 1887 in the Western calendar. Check the age and zodiac below.
Yes. Meiji 20 (明治20年 in Japanese) corresponds to 1887 in the Western calendar.
1887 is the Year of the Boar (亥(い) in Japanese) in the 12-year zodiac cycle. In the older 60-year sexagenary cycle (kanshi) it is 丁亥.
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 20 is written 明治20年 in Japanese. It is also commonly abbreviated M20 — for example on driver's licenses and other government forms.