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.