I agree that it’s very nice to be mortgage-free. But this is a decision that should be made in the context of an entire financial plan — your plans to retire, your total savings, your future expenses, how long you plan to stay in the house. This is the perfect time to get a financial plan from a FIDUCIARY advisor — one who puts your interests first, and fully discloses fees, and does not charge/hide commissions so is not trying to sell you something!
The way to find this type of advisor is to go to Wealthramp.com where all advisors are carefully vetted to meet these high standards. Maybe just one meeting will do it — or maybe you will develop a lifetime relationship. But this is the way to make this decision in context of your entire situation.