|Statistics on ageing make dismal reading. After the first two decades, life appears to be all downhill: brain, muscle, heart and the immune system begin their slow decline. And as skin wrinkles, hearing dulls and memory fades, the death rate - the chance that this year will be your last - rises relentlessly, doubling every eight or nine years.
Can science bring any hope into this gloomy picture? All the signs are that it can