In the 21st century, immortality via the complex operation known as the Stileman Process is attainable by a few wealthy and determined individuals, but the motivations that drive humans to live forever remain shrouded in mystery until "immortals" Dallas Barr and Maria Marconi stumble across a dangerous secret and find themselves fleeing for their lives--which have suddenly become very short.
What do You think about The Long Habit Of Living (1990)?