Before taking the leap into retirement, we need to give a lot of thought to how prepared we are for 20 or more years without a paycheck. The most important question, of course, involves income and expenditures, those we can anticipate and those that are harder to predict, such as long-term care. And will there be enough left over to pay for some of the fun things we have been looking forward to?
Zombies are, insofar as I understand their biological classification, undead. They aren't entirely dead, but they certainly aren't fully alive either. That sounds a lot like life with a serious chronic disease. When one's life no longer involves pleasure or the pursuit of interests, it is something of a half-life.