gertrude weaver , 116 , of camden , arkansas , became the world 's oldest person on wednesday following the death of a lady in japan .
she attributes her longevity to treating others well and exercising three times a week in her wheelchair .
gertrude would like to meet the president at her birthday party on 4 july because she has voted for him twice .
she was born in arkansas near the texas border in 1898 and worked as a domestic helper .