Aristotle made three divisions,--the growing period, the stationary period, and the period of decline.

Solon made ten divisions of life, and Varro made five.

Ovid ingeniously compares life to the four seasons.

Epimenides of Crete is said to have lived one hundred and fifty-seven years, the last fifty-seven of which he slept in a cavern at night.

Gorgias, a teacher, lived to one hundred and eight; Democritus, a naturalist, attained one hundred and nine; Zeno, the founder of the Stoics, lived to one hundred; and Diogenes, the frugal and slovenly, reached ninety years.