Eldest
Bouvier's Law Dictionary and Concise Encyclopedia · John Bouvier; revised by Francis Rawle · 1914
Bouvier's Law Dictionary and Concise Encyclopedia
He or she who has the greatest age. The eldest son of a man is his first-born, the primo-genitus; L. R. 2 App. Cas. 698; I. R. 12 Ch. Div. 171.
See Primogeniture.