Should I change my regular IRA to a Roth?

I have about 90k in my Reg. IRA. I am 61 and will start drawing about 10k a year in Social Security next March. I don't work and have no taxable income to speak of. I haven't had any income to speak of in the last 10 years and have been living on savings (and minimal investment income). Should I convert to a Roth? I am reasonably healthy and expect to live another 20 years. Suggestions? Advice?