How to navigate personal body change, and what's the secret to reaching 100?

As cosmetic procedures and weight loss treatments become more widely accessible, body changes can be rapid. So when the body you've known for years changes in a profound way, how do you navigate that mentally? And when – if ever – is it okay to comment on other people's bodies, or have a conversation about their appearance? Steve Molk lost more than 100kg over the course of three years and Professor Gemma Sharp is a clinical psychologist who leads a body image, eating and weight disorders research program.

When so many of us look back on the movies which shaped our childhood, one element stands out - the magic of Dick Van Dyke. The veteran actor is about to turn 100 - and he's still cheeky, energetic, and larger than life. So, what's the real secret to ageing well? Is it mindset? Attitude? Something more? Nancy Pahana is a geropsychologist and Everald Compton, 94, never plans to retire.

When we want to weigh the moral heft of a political decision in this country, we don't crack open a philosophy textbook. We pull up a stool at the nearest bar and ask, "does it pass the pub test?" But why is this our gold standard? Patrick Stokes is an Associate Professor philosophy at Deakin University.