It is not difficult to take vitamin/mineral supplements.
Again, the statistics mention only averages: it is possible that if your father had been a vegetarian, he might have lived five or ten years longer. Or maybe not.
My father smoked until he was 75 and died at 86. His brother was an MD, who either never smoked or gave it in his 20's, and played eight holes of golf until he died of a broken hip, or more accurately, complications arising from that. He lived to be 99 years, 7 months old. There was an aunt who made at to 105. When she reached 98, she became convinced she was a child again, strangely.