This quote does imply that intelligence is what a person has learned already. Not what they are capable of learning - which is actual intelligence. A person with a low intelligence (not quotient), might have a difficult time learning higher mathematical skills. A person with limited exposure to math, yet with a strong intelligence, can still learn higher mathematical concepts.
Whole life? Maybe. But many default adventurers are young. I can show you 20 year olds that have worked out for three or four years lifting weights. And then some people who have never lifted will come in and out squat them in a month. I can show you someone who sits and plays video games all day go out and outrun 90% of the school because they a genetically gifted. I can show you a guitarist who has practiced for ten years, and then a noob for a month, and the noob is better. If we want to talk real life, we are having a discussion between the Sport's Gene and Outliers. And Gladwell already stated that he was wrong.