Musicians and mathematicians do their most creative, innovative work before age 30 due to peak 'fluid intelligence,' while later-life work relies on 'crystallized intelligence' built from experience.

73:00before they turn 30. The greatest, sort of, creative genius that can come out of the human mind musically is before the age of 30. - Well, I think it's the same in mathematics, as well. You have this fluid intelligence versus crystallized intelligence. Fluid intelligence up until you're about, you know, in your late 20s, 30 years old, and then crystallized, so you're using... The crystallized is you're using your life experience to write things, so you'll find that composers:

73:31Bach, Beethoven, Mozart wrote their most important works at the end of their lives. Beethoven, the late string quartets, the Ninth Symphony, things like that. So, they have a whole lifetime of experience that lead up to this, and there's not... They're not improvising, but things for improvising, writing pop songs, and that... I think when your mind is really most active and your brain processing speed is at its pinnacle, that... This is just my theory-

74:01... that people can come up with those kind of ideas. Same with improvising. I think that most jazz improvisers, not all, but most, do their best improvising before the age of 30. - Creating something new. - Yes. - Truly novel, that requires youth. It's just a theory though, but it seems to apply. What do you think about the 27 Club? A bunch of the music greats died at 27.

74:28Hendrix, Brian Jones, Jim Morrison, Janis Joplin, Amy Winehouse. - Kurt Cobain. - Kurt Cobain, of course. A big part of music history is linked to drug history. LSD, coke, heroin, weed. - Smoking. - Smoking. - I think about this a lot. If you go back and you watch videos, The Beatles, any of their movies, they're smoking all the time. The Get Back documentary, they're smoking constantly. Go watch any of the