100 R. E. TUNBRIDGE 



The methods in routine use in clinical medicine today 

 would seem unlikely to contribute much to our understanding 

 of the problem of ageing. Nevertheless, human studies are 

 worth while even if they only assist us to understand the pro- 

 cesses which appear to accompany chronological age and so 

 enable us to make a contribution to the practical problems of 

 an ageing population or what has been aptly referred to as 

 "adding life to years". 



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