Hi Sherrina - Sorry for delay. Just saw this post. Single year of age data are not available for ZCTAs.
Options I can think of include:

Use a ratio approach to create your own estimate. Estimate the number of 13-14 year olds based on the 12-14 category in table B09001 + 15-17 year olds from table B09001 + estimate 18 year olds from the 18-19 category in table B01001. The sum = estimated population ages 13-18.

See if you can approximate the area you're looking for using PUMAs and the public use microdata files.

Hi Sherrina - Sorry for delay. Just saw this post. Single year of age data are not available for ZCTAs.
Options I can think of include:

Use a ratio approach to create your own estimate. Estimate the number of 13-14 year olds based on the 12-14 category in table B09001 + 15-17 year olds from table B09001 + estimate 18 year olds from the 18-19 category in table B01001. The sum = estimated population ages 13-18.

See if you can approximate the area you're looking for using PUMAs and the public use microdata files.