I believe that is one of the requirements, that you have to file taxes.
I found the IRS’s website on the rebates here
Quote “Millions of retirees, disabled veterans and low-wage workers who usually are exempt from filing a tax return must do so this year in order to receive a stimulus payment.”
And I, also over 70 and retired, just got a printed form from the IRS that said the same thing as Perchik (bless him) found on the IRS site. The mailing, by the way, cost a gazillion dollars.
It would be a lot easier to call a local CPA than to try to navigate the IRS site.