3 votes Currently voted the best answer Vote for this answer. The average age for a President to take office is 54.8 years old. The median age is 55. Eight men became President in their 40's, 24 in their 50's, and 10 in their 60's. The average age of death is 71 years old (assassinated Presidents not counted). As of Sunday, September 22, 2002 -- A quick sketch of American Vice Presidents.