Scott Sanderson, 62.
In the area of "famously deliberate pitchers" I'd also say Steve Trachsel outlives another one.
The idea that on a staff that boasted Rick Reuschel (obese), Dick Ruthven (artery problems), Dennis Eckersley (alcoholism), Steve Trout (heaven knows what), and Rick Sutcliffe (Mark Grace's secondhand smoke) that Scott Sanderson would go first is an upset.