In NYS what is the age limit on child suport?

Typically it is whatever the judge ruled it to be when s/he set up the child support order. It is usually 18 or completion of high school, sometimes even throughout college. Check your child support order for your terms and conditions.

Yes 18 to 21, depending on your child support order. Many have it where if the child goes to college support continues.

When child support stops is a matter of negotiation in Family Court. It should be specified in the court documents.