text: In 1943 , at 83 years of age , Burnham married his young typist , Ilo K. Willetts Burnham ( 1914 â `` 1958 ) .
simplified: In 1943 , when he was 83 years old , Burnham married his young typist , Ilo K. Willetts Burnham ( 1914 â `` 1958 ) .