@Hal_Al I found the information again in the following article:
The IRS will use people's 2019 tax returns to determine their stimulus payments, which means that teens who hit their 17th birthday in the second half of 2020 — after tax returns were due to the IRS — could still qualify.
https://www.kpax.com/news/u-s-and-the-world/second-stimulus-check-who-wont-be-getting-a-600-check
Also, my granddaughter turned 17 in Nov. of 2020, my son did get the $600 for my granddaughter who turned 17 in Nov. 2020.
