Let’s look at the math of the problem. If you have a $1,000,000 and the market drops 20% the year after you retire, you do not just lose $200,000. If you are also pulling out $50,000 a year to live on, your portfolio is being hit from both sides at the same time.
This is called sequence of returns risk. It is one of the most serious threats to a comfortable retirement, and almost nobody talks about it until it is too late. When you are relying on your portfolio for income, you cannot afford to just ride out major market drops the way you did in your thirties.