I accidentally put no when it asked "was my dependent under the age of 24 of 2019"? do I have to re-sent it or does the irs fix it?

You will need to correct this error by filing an amended return. However, you will need to wait to do so until your original return has been fully processed and you have received your refund (if applicable). Note: You can prepare your amended return in TurboTax but you are required to mail the completed return. Please follow the instructions to amend your 2019 return.