Where does it ask about my age to get the higher deduction?

In the My Info section, when you enter your personal details, TurboTax asks for your date of birth.

In the My Info section of the program when entering your personal information you are asked to enter your Date of Birth.  If you are age 65 or older you will automatically receive the higher Standard Deduction on your federal tax return.

Standard deductions for 2023

Single - $13,850 add $1,850 if age 65 or older
Married Filing Separately - $13,850 add $1,500 if age 65 or older
Married Filing Jointly - $27,700 add $1,500 for each spouse age 65 or older
Head of Household - $20,800 add $1,850 if age 65 or older