Robert Elryngton appears 9 times in Inquisitions Post Mortem between 1419 and 1446. If these are all the same man, and the same person as in Common Pleas in 1448, them he would probably have been born between 1475 and 1495. http://www.inquisitionspostmortem.ac.uk/quick-search/?q=elryngton&rq=elryngton&exact=false