Tadataka Ino — He Started Walking at 55 and Mapped Japan

Tadataka Ino's life divides cleanly into two acts. Act one: a merchant, who as an adopted son-in-law rebuilt a failing sake brewery and saved villagers with his own funds during famine, retiring at forty-nine. Ordinarily the story ends there.

Act two is the marvel: at fifty he moved to Edo and apprenticed himself to an astronomer nineteen years his junior, bowing to a thirty-one-year-old master to learn astronomy and surveying from zero.

From fifty-five he began surveying the whole of Japan — seventeen years, some forty thousand kilometers on foot, roughly the circumference of the earth — and after his death his disciples completed the map, whose precision astonished European visitors.

Two gifts from this life: learning has no age — a fifty-year-old's humility toward a younger master began everything — and great works need not finish within one's own act. At any age, a map can be drawn.

What do you work for?