A 90-year-old Kenyan grandmother has become the world's oldest elementary school student. Priscilla Sitienei, also known as Gogo, is at by down for from in of on to with a small village at by down for from in of on to with Kenya. She is studying at by down for from in of on to with the local elementary school to learn to read and write. Ms Sitienei has spent most at by down for from in of on to with her life working as a midwife, helping to deliver babies. She wants to be able to read and write so she can pass at by down for from in of on to with her midwifery skills and write at by down for from in of on to with the special herbal remedies she uses when she delivers babies. She also wants to be able to read the Bible. Sitienei said she never had a chance to go at by down for from in of on to with school when she was younger. She said she knows she is old but hopes she will set an example to younger people. She wants all the children at by down for from in of on to with her village to study. When Ms Sitienei first tried to enroll at by down for from in of on to with the school, the head teacher David Kinyanjui did not think it was a good idea. Now he is very happy that Gogo is at by down for from in of on to with the school. Mr Kinyanjui said Gogo is a "blessing and a motivator". He added: "I'm very proud at by down for from in of on to with her. She is loved at by down for from in of on to with every pupil. They all want to learn and play at by down for from in of on to with her." He also said: "She is doing well considering her age. I can say I have seen a big difference at by down for from in of on to with this school since she came." Gogo had a message at by down for from in of on to with children everywhere, saying: "I want to say at by down for from in of on to with the children at by down for from in of on to with the world, especially girls, that education will be your wealth." She added: " at by down for from in of on to with education, you can be whatever you want - a doctor, lawyer or a pilot."