No. Being over age 60 your retirement income is excluded from DE adjusted gross income, but interest, dividends and capital gains is not.
DE uses all adjusted gross income which is divided by your DE sourced income to arrive at a ratio. That ratio is multiplied by the tax on the total adjusted gross income to arrive at the tax on the DE source income.
You can see the calculations on line 42 which pulls from lines 30a and 30b.
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