( CNN ) -- The Rev . Billy Graham 's son is requesting prayers for his ailing father . Franklin Graham said that his father , who turned 95 in November , is extremely weak , but his vitals are good . `` Our family would appreciate your prayers for him that the Lord would strengthen him , '' the son wrote in a prayer request posted Tuesday on the website of the Billy Graham Evangelistic Association . `` Only the Lord knows what is in store as we move forward in service to Him , '' he said . The elder Graham returned home late last month , two days after he was admitted to a hospital for pulmonary-related tests and observation . He was admitted to the hospital in October for similar tests . Graham , who lives in western North Carolina , has provided counsel to generations of U.S. presidents , beginning with Harry S. Truman . Staging revivals that he called `` crusades '' around the world , the founder of the Billy Graham Evangelistic Association has reached untold millions of people in person . Graham began his missionary work in 1944 when he started speaking at rallies for the Youth for Christ/Campus Life ministry . Five years later , he was holding a `` crusade '' in tents in downtown Los Angeles . `` We value your prayers -- in fact , we depend on them , '' his son wrote in the request . `` We find words of comfort and praise in the psalms , 'Oh , bless our God ... and make the voice of His praise to be heard , who keeps our soul among the living , and does not allow our feet to be moved . Come and hear , all you who fear God , and I will declare what He has done for my soul . Blessed be God , who has not turned away my prayer . ' `` CNN 's Janet DiGiacomo and Phil Gast contributed to this report .
The Rev . Graham celebrated his 95th birthday in last month . He is extremely weak , but his vitals are good , his son says . Billy Graham was hospitalized November for pulmonary-related tests and observation .