Studies in Ancient Hindu Polity (Based on the Arthashastra of Kautilya), Vol. I c8.s1.2

c8.s1.2

(i) those that were 14 feet high, 18 feet long, and 20 feet in girth, and were from these measurements inferred to be of forty years of age; (ii) those that were thirty years old; and (iii) those that were twenty-five years old.