It makes sense because Simba vanished them after Scar's reign and
sometime durring his reign, probably near the end or at the end or
after his reign would make the most sense, Kovu was born so he is the
youngest outlander.

ecco creek u are so right. i agree with everything u
say!

oops i meant to the OUTLANDS SOZZZZZ

Zira was a follower of Scar,and Simba exiled her to the
Outlands.

Well, there is a large gap between TLK1 and TLK2. Many
people have filled in this gap with their own opinion on how
it happened. For example, Zira and Scar had a love
relationship, and when Scar died, Zira took vengeance and
killed someone close to Simba(this could include Sarabi,
since she wasn't in TLK2, or Kopa, a cub character from TLK
storybooks and the cub from the end of TLK1) and Simba
exiles her and some other lionesses who may have been on her
side, as well as her cubs. Since Zira is not Kovu's mother,
nor is Scar his father, the lioness who gave birth to him
could have been killed in the struggle between Simba's side
and Zira's side.
Just an opinion. ^^