IKINU, Kenya (Reuters) - As Njoki Wainaina shuffles out of the doorway of her tiny Kenyan home, she certainly looks old. Her tiny, bird-like body, wizened face and gnarled finger and toenails make it entirely believable she could be 143 years old, as her family claims. If they are right, she would be more than 20 years older than Jeanne Calment of France, who died last year at 122. It would also make her two years older than a Nepalese man who died last year at, according to relatives, the age of 141. "She is 143 years old," said Njoki‘s relative Stanislas Wainaina Kinyua, a mere stripling at 78. Her age is hard to prove. Birth certificates weren‘t widely used until after independence from Britain in 1963.