Per IRS Publication 936 Home Mortgage Interest Deduction, page 5:

Reverse mortgages. A reverse mortgage is a loan where the lender pays you (in a lump sum, a monthly advance, a line of credit, or a combination of all three) while you continue to live in your home. With a reverse mortgage, you retain title to your home. Depending on the plan, your reverse mortgage becomes due with interest when you move, sell your home, reach the end of a pre-selected loan period, or die. Because reverse mortgages are considered loan advances and not income, the amount you receive isn't taxable. Any interest (including original issue discount) accrued on a reverse mortgage is considered interest on home equity debt and isn’t deductible.

Please see the Federal Trade Commission's website Reverse Mortgages for additional information.