When is the right time to stop breastfeeding?

Hi there fellow mum's, currently I'm breastfeeding my 2 babies who are now 14 months. With my eldest he stopped being breastfed shortly after he turned 1. The twins still grab at my top/bra etc when they are hungry so I would guess they are still needing milk.

What age did you stop breastfeeding and start with follow on milk?