Enter a reference year to automatically build an age reference chart that lists, for each birth year, the full age, the Western year, the Japanese era (wareki) and the Chinese zodiac sign. The reference year is free to change (2026, next year, etc.), and age is computed as reference year − birth year (the age reached during that year). The era covers Meiji, Taishō, Shōwa, Heisei and Reiwa, and a year in which the era changed (such as 2019) shows both eras. The zodiac is the 12-animal cycle and can be hidden with one checkbox. Sort by youngest or oldest first, and print the table cleanly on A4. Useful for reception lists, confirming ages at ceremonies, and checking Japanese-era years on forms. Everything runs in your browser; the year you enter is never uploaded, and display preferences stay on your device.