How exactly does his position equate to being a "late bloomer"? Even if he hadn't done everything he did in the last 10 years, he would still have achieved more

How exactly does his position equate to being a "late bloomer"? Even if he hadn't done everything he did in the last 10 years, he would still have achieved more than 99.99999% of the world population. Think about that to get some perspective. I think he's being ridiculously harsh on himself.