Timing and desire. Here’s a a passage from Keith Richard’s book Life. Gus was his grandfather.
“Gus was leading me subtly into getting interested in playing, rather than shoving something into my hand and saying, “It goes like this.” The guitar was totally out of reach. It was something you looked at, thought about, but never got your hands on. I’ll never forget the guitar on top of his upright piano every time I’d go and visit, starting maybe from the age of five. I thought that was where the thing lived. I thought it was always there. And I just kept looking at it, and he didn’t say anything, and a few years later I was still looking at it. “Hey, when you get tall enough, you can have a go at it,” he said. I didn’t find out until after he was dead that he only brought that out and put it up there when he knew I was coming to visit. So I was being teased in a way. I think he studied me because he heard me singing.”