About 6 - my mother taught me. In, over, through, off.... but it was ages before I became at all proficient. (Not that I've ever been proficient enough for fancy patterns.).
I had to knit something simple for Brownies - it never got finished and the feeling of having. to do it finally made me leave the Brownies - after which there was a message to say, 'Brown Owl wants her red wool back!'
My Swedish friend finds our way of knitting very odd - she didn't show me how they do it, though.
I never learned to crochet. Was put off for life by all those crocheted ponchos etc. in the 70s - a flatmate used to make them, all in horrible garish colours! A daft prejudice, I know.