“I have Social Security of $3,000 a month after taxes.” (Photo subject is a model.) - MarketWatch photo illustration/iStockphoto Dear Help Me Retire, I am 75, in good health, and still working, but I would like to leave my job, which is boring and provides no satisfaction. I have$830,000 in cash and investments, along with $300,000 in equity in my home, on which I owe$75,000. I receive $3,000 per month in Social Security after taxes. My investments have returned 25%-30% over the past few years, as I h ...