I’m 67 and retired with $57,000 left on my mortgage and $600,000 saved for retirement — should I pay off my home now?

Dear MarketWatch,

I am 67 years old, single and retired at 66. After taxes, I receive $3,100 per month from a pension. After taxes and my Part B Medicare payment, I receive $2,100 per month from Social Security. I have approximately $100,000 in mutual funds/savings accounts and $500,000 in my 401(k) account.

I am able to live comfortably on…