Solved
TurboTax Free online version defaulted to Elderly Tax Credit for a single person, but we should get it for a couple. For single, it's a $90 credit, for a couple, it's $140. I can't find a way to select couple to get the higher credit.
The Unified Credit for the Elderly is up to $140 for married taxpayers when both spouses are 65 or older. However the actual amount the couple qualifies for depends on income level. They would only qualify for the full $140 if their federal adjusted gross income is under $1,000.
If their income is at least $1,000 but less than $3,000, they would qualify for a $90 credit.
There is no $90 credit for single taxpayers or married taxpayers with only one spouse being 65 or older, so it seems the couple's income is between $1,000 and $3,000 and TurboTax is correctly calculating the credit.

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