Original:  Mr Key, also 45-years-old, said at the announcement of the new leader and deputy leader that he was honoured that he was chosen to be the new leader of the National Party and also hounoured that Mr English would be his  deputy.
Revised:  John Key, also 45-years-old, said at the announcement of the new leader and deputy leader that he was honoured that he was chosen to be the new leader of the National Party and also hounoured that Mr English would be his deputy.
Edit intent: clarity