Is Retirement Biblical?

I am posing a question today. To be clear, I don't have a hard and fast answer - but I want to know what you think.

Today's society has set up a time in your life when you "retire." What does that mean? Different things for different people: for some, it means traveling around the Carribean and taking your leisure, for others it means spending large amounts of time and money on their grandchildren, and to others it means that they finally do the job they have been longing to do their whole life. However you define it, it is usually marked by the quitting of your "job" and living on your accrued savings.

My question is this: "Is retirement God's plan for us?"
Here are a couple of things to think about:
1. Retirement is not mentioned one time in the Bible: people worked until they died or could not work anymore.
2. The Bible calls people fools who store up treasures for themselves and aren't rich toward God. (Luke 12: 13-21)
3. The Bible says that this life will be difficult and that we will live through hard work. (Gen 3: 17)
4. Depending on how we look at retirement, does it send a message that our usefulness as a contributing member of society is done?
5. If we lived our lives differently, would we even need retirement - if we did the jobs that were our passion, if we took times of relaxation, if we lived life in balance?)

Let me know what you think.