On: "If you're over 30, you're a slow old man" – Zuckerberg. He turns 30 tomorrow.

[jesuslop]

"Von Neumann used to say that a mathematician is finished by the age of thirty. As he got older, he increased the age to thirty-five, then to forty, to forty-five, and soon to fifty." .- Indiscrete thoughts, ch. XX. / by Gian-Carlo Rota.