Peter Attia says we have more knowledge than we use to stop deterioration from ageing

We assume ageing involves a loss of physical capacity, but Dr Attia argues it doesn't need to be that way. (Getty: Blend Images, Dave and Les Jacobs)

There's one worry older patients bring up constantly with Peter Attia, a US physician who specialises in longevity.

It's not about how to live an extra few years, or whether they're likely to die at 85 or 90.