In Focus:

drugs delay the diseases of ageing

Imagine having to ask a 95-year-old to slow down - well, I did. Hilda Jaffe was walking so fast there was a risk that the small group following her would be left behind.

We had just met in the lobby of the New York Public Library on Fifth Avenue and 42nd Street, where Hilda is a volunteer tour guide, and she was escorting us to the vast, elaborately decorated Rose Main Reading Room.

Hilda doesn't walk so much as stride. I know people 60 years her junior who are less nimble on their feet.

In common with other super-agers, Hilda has retained her zest for life and knowledge.

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