Today, I have been debating with my girlfriend for this. She says, Supergirl is younger than Superman. And, I say, Nope.

According to her, Supergirl wasn't born when Krypton was destroyed. She was born on Agro City which survived Krypton's destruction.  

[Wikipedia][1] says,

> Kara Zor-El is the last survivor of Argo City, which had survived the
> explosion of the planet Krypton and drifted through space. When the
> inhabitants of the colony are slain by Green Kryptonite, which was
> released by meteorites striking the lead barrier, Kara is sent to
> Earth by her father Zor-El **to be raised by her cousin** Kal-El
> (Superman).

Zor-El was seeking Superman to raise Supergirl. So, my girlfriend says that she won. But, I say the concern might be because she was a girl (But, I am not confident).

I have seen Supergirl to try taking responsibility for her *baby cousin*. She has even said it exclusively that She don't like a Kryptonian half of her age flying into danger. I have seen it many times. So, I am confused. Does she say such things *humorously* or she is older than Superman?


  [1]: https://en.wikipedia.org/wiki/Supergirl