What was the age of the Qaid-e-Azam at the time of his death?

What was the age of the Qaid-e-Azam at the time of his death?

قائداعظم کی وفات کے وقت ان کی عمر کتنی تھی؟
Explanation

Quaid-e-Azam Muhammad Ali Jinnah was born on 25th December 1876 in Karachi.

He was passed away on 11th September 1948 in Karachi, Pakistan.