no
see links below
16
When they are 18.
When he is 18.
see related link
NO, a judge can take it into consideration, but at no age under 18 can do that.
See Link Below'Child Refusing To Visit Other Parent?'
If he has a court order I think he can.
Minors are not responsible for those decisions. The custodial parent is responsible and is the one who will be held accountable by the court. The children don't get to decide that they can disobey a custody agreement at any age.
The information concerning when the terms concerning visits to non-custodial parents should end should be on the court order.
I think 12 or 13 but I'm not an expert and I'm not 100 percent sure
15 is the real age to make legal decisions. Not all, just most.
Assuming the parent has court-ordered visitation, no she can't. If there is a legitimate reason the child does not want to visit the parent, the custodial parent can petition the court to revise the visitation order. Be aware the court will not deny a parent the right to visitation without a very good reason, nor will they look kindly on a custodial parent who request it without a very good reason.