There is no such senior tax refund on a federal tax return. Are you referring to a state tax return? If so, which state?
On a federal tax return there is an increase in the Standard Deduction for those age 65 or older
Standard deductions for 2024
Single - $14,600 add $1,950 if age 65 or older
Married Filing Separately - $14,600 add $1,550 if age 65 or older
Married Filing Jointly - $29,200 add $1,550 for each spouse age 65 or older
Head of Household - $21,900 add $1,950 if age 65 or older