Actually, I do prefer kid Cable to old Cable.
The old Cable was originally not meant to be the son of Cyclops. He was retconned to be his son but he's too old for that so they came up with a lot of ridiculous stories to explain his age.
Kid Cable should be what Nathan would have been if Nathan had grown up normally.
It's just like how Magik can't be older than his brother Peter. The same should be said of Cable, he can't be older than his father Scott.
Both Magik and Cable were almost babies at that time, and they should be just teenagers now.