As you know, we have many characters in out Justice Japan Fanfiction!  So I thought we might highlight those who are or will become mothers for this Mother's Day.

Person who will become the oldest person to be a mother.

A toss up
Wonder Woman will probably become mother to Superman's children(See The Kingdom or Project A-ko), if she's still alive in the Legion of Super Heroes 30th Century, then she will be the oldest person to be a mother in our continuity.
Possible future Wonder Woman Children
[link]
The Many loves of Wonder Woman (She has many suitors)
[link]

Sailor Moon will become mother to Chibi-Usa, and she'll still be alive in the 30th century according to her cannon fiction!
[link]

Mother who chose to become a Superhero!
Red Tornado (Abigail "Ma" Hunkel)
[link]

Character that most fanfictioners say is a mother
Sacred Bow/Kagome Higurashi (InuYasha)
[link]

Worst Super Heroine Mother
I found these....
Troia/Donna Troy (Mother of Lord Chaos(Robert Long))
[link]
Power Girl/Karen Starr (Mother of Equinox, son of Arion of Atlantis)
[link]

If anyone has better suggestions, or would like to pose a Mother's Day style question of these characters themselves, please do.
Possible questions
Most recently became a mother
Mother with the most children
Mother with the most Grandchildren