Niels Bohr - 26
Wolfgang Pauli - 21
Werner Heisenberg - 23
Alber Einstien - 26
Paul Dirac - 24
Alan Turing - 26
Donald Knuth - 25
John von Neuman - 23

The number next to the name is the age at which the person obtained his PhD.
Going by those numbers.....I am a failure!!! :-(