Twombly lahia di Lexington, Virginia, pado tanggal 25 April 1928. Ayah Twombly, disabuik juo jo "Cy", adolah pamain baseball untuak Chicago White Sox. Kaduonyo disabuik jo namo Cy Young nan pernah bamain baseball untuak, antara lain, Cardinals, Red Sox, Indians, jo Braves.
Lexington, Virginia