TurboTax goes by the code in box 7 of the Form 1099-R, not the personal info.  only if the code in box 7 includes code 1 or code J will TurboTax potentially calculate an early-distribution penalty on the distribution.  However, if the payer does use these codings, you can claim an Other reason exception to the early-distribution penalty.  If code 1 or J is present, contact your IRA custodian to inform them of your correct birthdate so that they report future distributions correctly.