Born in Ballyhea, County Cork, O'Callaghan first arrived on the inter-county scene at the age of seventeen when he first linked up with the Cork minor team before later joining the under-21 side.
O'Callaghan was born in Ballyhea. O'Callaghan first arrived on the inter-county scene at the age of seventeen when he first linked up with the Cork minor team before later joining the under-21 side. Ballyhea was County Cork.