Excellent book about running into your 70s an 80s

Seems to only be available in England and various European countries, so I bought a copy in Cham. A long time fell runner, working through what is going on with his body as he approaches 70.

Lots of science research cited, but it's written for the lay person, with enough information for the curious to get to the clinical data.

I was hooked by his back of book blurb, " Welcome to the uphill struggle of going downhill."