Application under order xxxiii cpc

In a civil case which is in progress and written statement has been filed and issues framed, can the plaintiff make an application for being treated as an indigent person and seek exemption in payment of court fee? The plaintiff has recently undergone an expensive medical treatment and is left with no funds of his own. He has no property or income of his own other than the old age pension of Rs. 2500/- from the State Government. He is aged 69. The residence which he stays belongs to his wife.