from My best Observation according the post, if her Grandson is in his 50's means Mama is possibly less than 120 years. ie: eg if the Grand son is 55yrs, i project the father to the grandson( direct son to Mama) to be between 85-90 yrs. If it goes this way, then mama at the time she got married should be less than 30 yrs. If this is true, then Mama should be less than 120 yrs. Maybe in the range of 105 to 115 yrs Maximum. All the same, its a wonderful Blessing from God. Its really a shameful thing that Nigerians till Today cant give an accurate birth data, and not even an Elctronic ID Card to know who is a Nigerian like its done here in the Western world. Great thanks to the Poster.