Many pages say 1940 but there are also pages that say that he was born in 1937. Did he lower his age with a few years for academic reasons like many others of the pre-colonial generation or was it just a mistake in a biography written on a website and many just blindly copying it.  If remember well on Top Congo FM "Mindule ya Bakulutu" someone explained that there used to be a Catholic Belgian priest who came with a rule that if you reached a certain age (I think 15 but I'm not sure) you could not go to school anymore, which made many parents in Belgian Congo lower the age of their children on paper.