His precocity as a mathematician and as a father perhaps influenced the early greying of his hair, but it has not altered his boyish look or his easy and modest manner.
Kanyang maagang pag-unlad bilang isang dalub-agbilang at bilang isang ama marahil naiimpluwensyahan ang mga unang bahagi ng puting ng kanyang buhok, ngunit ito ay hindi altered kanyang kabataan hitsura o sa kanyang katamtaman at madaling paraan.