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These are the tax brackets for Single taxpayers.
Single Filers - Taxable Income
$0 to $9,225 - 10%$9,225 to $37,450 - 15% $37,450 to $90,750- 25%
An 89 year old Single Individual would be entitled to a Standard Deduction of 7,550 & a personal exemption of 4,000., which means that unless he has income over $11,550. he isn't required to file a federal income tax return.
You didn't mention a state, so that issued isn't addressed.