Dependent or not

My son was 24 in2020 and a full time student . Is he my dependent or a qualifing relative, but he earned 15,000 in 2020.?. 1. For the tuition deduction?

 

And Question2. Are his medical insurance premiums deductible in my return?

I'm getting mixed information on the age rule. Some say he has to be under 24, others say 24 as in this post from this website;

They are under the age of 19 (or 24 for full-time students).