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Why is retirement planning so commonly recommended?
I actually really like the way you positioned this question. If you love what you are doing every day, why would you ever want to quit, right? I'd think of retirement as a safety net instead. Your retirement can be a fall back for if something happens if you are unable to work or deicide to work less. There are some really good answers listed here, but I think it depends on how you want to view, or rather define retirement.