‘Pace yourself’: lessons for King Charles on working in your 70s

From failing eyesight and tiredness to dealing with younger colleagues - some of the challenges facing the new king

• Accession of King Charles and death of Queen Elizabeth - latest updates

The biggest challenge for those, like the King, who are working in their 70s is adapting to change, according to David Smith, 73, who, for the past 20 years, has been chief officer of the men's charity, 15 Square.

I think a lot of people get into their 70s and say I've always done it this way and this is how I'm always going to do it'," says Smith, who is the same age as Charles. And that is a recipe for disaster. You have to embrace change."