Letters 58.30

Plato himself, by taking pains, advanced to old age. To be sure, he was the fortunate possessor of a strong and sound body (his very name was given him because of his broad chest); but his strength was much impaired by sea voyages and desperate adventures. Nevertheless, by frugal living, by setting a limit upon all that rouses the appetites, and by painstaking attention to himself, he reached that advanced age in spite of many hindrances.

Seneca, Letters to Lucilius 58.30, translated by Richard Mott Gummere