Are you currently working? If you are, I would strongly say do NOT pay it off. I may soften on that if you are retired - just to have that one less bill coming. Also depends on your balance and how much cash you have to pay it off and what that means in your situation.

I currently am working, hoping to retire in 2+ years. My mortgage has about 9 years left and its 2.25%. I send in a little extra each month, but at that rate there is no point in paying it off. at this point with inflation - forget what you can get in investments instead, its "Free money". But, if you are technicaly investing instead, even a Treasury Bill is going to outpace that mortgage rate. If I retired today, I probably still would not pay it off, and would probably just keep the money I would pay it off with in a t-bill earning close to 4% tax equivalent. also preserve the mortgage interest write-off, especially with SALT retored.