I was very surprised by this question because of course there is no age that is best to learn to draw. I understand why this question was asked however because when we get older starting a new hobby or returning to a rusty skill like drawing seems too daunting and we might think, is it worth starting?
This question is a bit sad I think because it suggests that once we reach a certain age we can’t learn anything new. It also suggests that it would be too late to reach a stage where we have ‘learnt’ to draw. As someone who studied art I can say that there is no end point the learning continues so who can really say when we have ‘learnt’ to draw?