John: so Jack, how many kids you got now?
Jack: less than 5
John: well...how many?
Jack: figure it out; the product of their ages equals twice the sum.
John: that's nice; but not enough info.
Jack: my wife gave birth a year ago.
John: still not enough.
Jack: the age of my oldest is the same as the number on this door.
John: hmmm...that helps...still not enough.
Jack: the two in the middle...
John: stop there! I know how many kids you have, and also their ages...
Can you figure it out also??