There are two ways to measure life expectancy: objective (wall clock) time and subjective time: life as we experience and remember it.
A long boring life is subjectively shorter than a short, exciting life that is full of memories. The boring, repetitive parts (commuting to work, sitting in a cubicle, watching television) get compressed while the exciting and novel parts stay fresh. The best way to live longer may be to maximize the quantity of memorable life experiences. We have more control over our experiences than our biological timeline.
What are you doing to optimize your subjective life expectancy?