One of the confusing things about planning for retirement is trying to figure out how long it will last. It's as if I was crouched at the start of a race without any idea how long the race will be. If it's going to be short, maybe I should sprint for it and not worry too much about running out of energy. But if it's going to be a marathon I'll want to nurse my resources and watch them carefully so I don't run out too soon. But getting some idea how long the race will be means figuring out my life expectancy.
- At least one new roof, perhaps two.
Planning for retirement is usually over-simplified and full of bad assumptions, like this one: "Assume you will need 70%-80% of what you earned pre-retirement." Well you won't be sending your children through college and maybe you will have your mortgage paid off. And you won't have commuting costs, or still be trying to save for retirement. But on the other hand you will have much higher medical expenses, you may be sending your grandchildren through college, you may be providing financial assistance to your children or your parents.