Really the deciding factor is my daughter. I don't want to disrupt the routine too much until she graduates high school. But as soon as that is no longer an issue, then there really is no reason to keep working when I really don't want to.
This is the same boat my DW and I are in at the moment, although we have longer to go than you. Our DD is in 5th grade, so I have nearly 8 years to go. We would retire sooner on less, but we really want to keep her in the school she loves and not disrupt her life for our ER.