Pfizer-BioNTech is approved for people 16 and older.
Moderna is approved for people 18 years and older.
Johnson & Johnson is approved for people 18 years and older.
Children ages 12-18 years have only been included on one vaccine study (Pfizer-BioNTech). Moderna has begun a prospective placebo-controlled trial for those 12-17-years old. No children less than 12 years have been included on any study thus far. Much more data is needed before vaccine administration to children.