Thoughts. Translation by J.G. Nichols [Hesperus Press, 2002, ISBN 9781843910121], p. 6 
Aphorisms
                                    
“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.”
             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)
        
Original
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.
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Marcus Tullius Cicero 180
Roman philosopher and statesman -106–-43 BCRelated quotes
1922 Source: Geraldine Taylor. Behind the Ranges: The Life-changing Story of J.O. Fraser. Singapore: OMF International (IHQ) Ltd., 1998, 269.
“The vivacity which increases with old age is not so far removed from folly.”
                                        
                                        La vivacité qui augmente en vieillissant ne va pas loin de la folie. 
Maxim 416. 
Reflections; or Sentences and Moral Maxims (1665–1678)
                                    
                                        
                                        "Purely Personal Prejudices" 
Strictly Personal (1953)
                                    
Source: Household Papers and Stories (1864), Ch. 10.
Reflections on Various Subjects (1665–1678), VII. On Air and Manner
"David J. Gross - Biographical" http://www.nobelprize.org/nobel_prizes/physics/laureates/2004/gross-bio.html, Nobel Prize in Physics, nobelprize.org (2004)
Disme: the Art of Tenths, Or, Decimall Arithmetike (1608)