“And, indeed, when I reflect on this subject I find four reasons why old age appears to be unhappy: first, that it withdraws us from active pursuits; second, that it makes the body weaker; third, that it deprives us of almost all physical pleasures; and, fourth, that it is not far removed from death.”
Etenim, cum complector animo, quattuor reperio causas, cur senectus misera videatur: unam, quod avocet a rebus gerendis; alteram, quod corpus faciat infirmius; tertiam, quod privet fere omnibus voluptatibus; quartam, quod haud procul absit a morte.
section 15 http://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A2007.01.0039%3Asection%3D15
Cato Maior de Senectute – On Old Age (44 BC)