I have 2 adult children that are both full-time students and our annual income is around $400K. Should we claim our children as dependents on our tax returns?

Our children are 22 & 20 years old, both worked part-time, but didn't make more than $6000 each for their summer job employments and will be filing their own returns for those jobs.  They have college expenses, but we (parents) paid these for them.