Do you want to live to 100? Thanks to modern medicine, you have a decent chance of doing so. But if you want to live well to 100, physician and best-selling author Peter Attia says you may have some work to do so that your last decade of life - your "marginal decade," as he calls it - is healthful and rewarding, not limited by disease.Subscribe to The Post Most newsletter for the most important and interesting stories from The Washington Post. If we adopt new ways of looking at our health, we ca