User blog comment:DarkSkullPirates/Mommas in One Piece~!/@comment-89.201.139.218-20120511200553/@comment-4889755-20120511201659

well.

In Chapter 0, it showed Makino as a little girl, and ace as a newborn. Ace being 20 years old at the same time Luffy was 17 years old, means that Makino would only be a few years older than luffy (5-6) meaning that if Makino was Luffys mom, she would've had to have a baby at like 5 or 6 years old. ;/