• Qualifying dependents expanded. Unlike the first two payments, the third payment was not restricted to children under 17. Eligible individuals received a payment based on all of their qualifying dependents claimed on their return, including older relatives like college students, adults with disabilities, parents and grandparents.

https://www.irs.gov/coronavirus/third-economic-impact-payment#:~:text=%241%2C400%20for%20an%20eligib...