Well, because he looked around himself and he saw all these fabulous physicists that created quantum mechanics and modern physics, and they were all in their 20s and early 30s when they did so.
Porque ele se viu rodeado de todos esses físicos incríveis que criaram a mecânica quântica e a física moderna, e estavam todos na faixa dos 20 e início dos 30 anos quando fizeram isso.