How old was George Washington when he was inaugurated?

as well as john adams,thomas jefferson,james madison,james monroe,john quincy adams, andrew jackson,martin van buren,william henry harrison,john tyler,james k. polk,zachary taylor,millard fillmore,franklin pierce, james buchanan,abraham lincoln,andrew johnson,ulysses s. grant,rutherford b. hayes, james a. garfield,chester a. arthur,grover cleveland,benjamin harrison,grover cleveland,william mckinley,theodore roosevelt, william howard taft,woodrow wilson,warren g. harding,calvin cooligee,herbert hoover, franklin d. roosevelt,harry s. truman,dwight d. eisenhower,john f. kennedy, lyndon b. johnson,richard m. nixon,gerald r. ford,jimmy carter,ronald reagan,george bush,bill clinton, george w. bush.