For people age 6 months through 64 years, CDC recommends any available age-appropriate vaccine product.
For adults age 65 years and older, three flu vaccines are preferentially recommended: Fluzone High-Dose Quadrivalent, Flublok Quadrivalent recombinant, and Fluad Quadrivalent adjuvanted flu vaccines. In June 2022, ACIP concluded that these three vaccines are potentially more effective than standard dose, unadjuvanted flu vaccines. However, if none of the three vaccines are available, people age 65 years and older should get any other age-appropriate flu vaccine.
Review the full explanation for the ACIP decision in the 2022 published ACIP recommendations for influenza vaccination: www.cdc.gov/mmwr/volumes/71/rr/pdfs/rr7101a1-H.pdf.