> Learning at that age is easier ... at the very least because you have tons of free time.
That isn't really a valid argument here though because Lambda School is a full-time program to my understanding, so it's expected you somehow have 8 hours a day to put into it.
I'm not sure. But what's definitely true is that it's WAY harder as an adult.
Most self-taught programmers I know (including myself) learned to program as children/teenagers. Learning at that age is easier -- if not biologically, then at the very least because you have tons of free time.
The few I know who self-taught programming but didn't learn as youth already had really strong backgrounds in mathematics or physics, and leaned heavily on the skills that studying those fields teaches you.