My children are 9yrs & 7 yrs old and they have to see their father every other Saturday 10 - 4 by a court order.

They do like particularly like their father and want to know at what age can they stop seeing him ?

What age can my 9 & 7 year old stop seeing their father who I am divorced from.

At 18 when the court order ends. Or at any time you go back to court and get the court ordered modified.

Why do they not want to go.
If you are talking bad against him, he could even use that in court to get more time with them or even custody.

Why does he not have more time with them, since there is little he can do with just 6 hours.

Have you tried counseling to work them into a relationship with him.