The only thing that changes, about thge amount of your income subject to tax, at age 65, is a slightly higher standard deduction. Other than that, you are subject to the same income tax rules as everybody else.
There is a credit for the elderly or disabled (you don't have to be both). But because it has not been adjusted for inflation since 1983, very very few people qualify. If you qualify, TurboTax (TT) will automatically calculate it.
