Never. And I have skin which is very sensitive to the sun. If I'm out in any kind of sun, I need factor 30 at the very least.
I don't wear sun screen much though. I wear loose, cotton clothing and a big straw hat. I stay out of the sun in the middle of the day. I have worked hard to find the balance between being outside for my health, good levels of vitamin d for example and avoiding sun damage.
I work on the principle that any change of colour is sun damage. My Mum's had skin cancer twice now and is monitored every few months.
I do the same with my dc. Loose, long sleeves and a big hat, sun cream where absolutely necessary and a healthy, mindful attitude to the sun.