Alex saw how Kiovu looked at Sarah, And his heart sank. Alex didn't know how to tell the young cub that himself, John and Sarah were different then other lions. The fact that Alex looked to be younger then Simba.

What he really was not wanting to say was the fact that the twins were older then Kovu and Kiara. By the time young Kiovu was old enough to have cubs the twins would just have become adolescents.