Wearing a bold print gets harder as you get older. Its safer to stick to subtle prints or block colours. I have always found prints quite tricky. My daughter Carly, who is on the design team at Stella McCartney, is obsessed with them.

Knitwear can play a vital part in layering. The simplicity of a lightweight cardigan makes it one of the best ways to layer outfits. I love granddad cardis for winter, worn over a vintage lace shirt, waistcoat and full skirt with slouchy boots.

For me, getting older doesnt mean throwing away a favourite-coloured lipstick or a fabulous pair of boots; instead, its about harnessing all the great things I have learnt over the years about what does and doesnt suit me, and enjoying the way in which cleverly selected outfits can enhance the nice bits.

I eat healthily because that's the way I prefer to eat, and I'm sure it helps keep the weight off.

I’m just mad for San Francisco. It is like London and Paris stacked on top of each other.

The trick is to find the style that is right for you. When it comes to trying new clothes, my advice is not to take it too seriously - it's all about having fun.

Being young isn't about age, it's about being a free spirit. You can meet someone of 20 who's boring and old, or you can meet someone of 70 who's youthful and exciting. I met Fred Astaire when he was 72 and I was 21, and I fell in love with him. He certainly was a free spirit.