Dear James, ideally for SBI PO, candidates must be aged between 21 to 30 years as on April 1st, 2019. However candidates belonging to Reserved Categories like SC/ST/OBC/PWD/Domiciled/Ex Servicemen will be given relaxation as per their respective categories. For Ex-Servicemen, there is a 5 year relaxation. And at 36 years, you unfortunately do not fulfill the age criteria.