48 General Discussion 



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DISCUSSION 



Tunbridge: Prof. Lewis has emphasized the need to remember that 

 longitudinal studies have an important bearing on the true interpreta- 

 tion of results and that the statistical approach may be quite fallacious. 

 Too often, as he said, our standards have been based on a few medical 

 students, or two or three staff members, and the assumption has been 

 made that that is a fair age distribution of population. Our standards 

 for all functions, hearing, sight, etc., may be completely wrong. What 

 we consider at the moment to be normal for seventy may actually be 

 super- normal. Heredity also may be a factor but it may not be the 

 most important factor. How far is longevity in any way chromosome 

 determined? Prof. Lewis questioned whether there is such a thing as 

 healthy ageing or pathological ageing. I think that is a thesis which 

 needs looking at rather carefully, and in our discussion I hope we shall be 

 cautious, and take up some of the pathological approaches critically, 

 because we may be fixing in time a biological process and automatically 



