Lucy_in_the_Sky Wrote: It's because Pfizer's phase trial included people 16 or older in their testing but Moderna and J&J started at 18. Not sure why they went younger then the other two though.
Yep. It's all about who was and wasn't included in clinical trials. If kids (I'm lumping in 16-17 years old's in this category) weren't included in the trials then the FDA won't authorize its use on them.
Clinical trials for children are notoriously difficult. Many parents, rightfully so, are hesitant to use their children as guinea pigs.