[Blackbeard D. Kuma]

Here's some more juicy info, guys. Credit goes to Sandman from AP forums.

Volume Z

Spoiler for Z's Life:

[Age 14]
Z entered the Naval Academy. He wanted to be a hero.

[Age 18]
He took part in actual fighting for the first time.

[Age 28]
Z was promoted to petty officer. He mastered Rokushiki. He realized that Marine is not always a hero.

[Age 34]
He began to be called "Black Arm". He was the master of Armament haki.

[Age 38]
He was promoted to Admiral. Zephr was popular among his subordinates. Roger and Whitebeard were in their golden age at that time.

Z married.

[Age 39]
Z's son was born.

[Age 42]
Z's family were killed by a pirate. Z intended to resign Marine, but higer officer persuaded him to stay Marine. Z became an instructor.

Akainu (age 23) and Kizaru (age 26) joined Marine. Both of them were already "Monsters".

[Age 44]
Aokiji (age 19) joined Marine.

[Age 50]
Z gave strict lessons to his disciples.

[Age 65]
A pirate cut Z's arm off.

[Age 70]
A Marine scientist gave "Battle Smasher" to Z.

[Age 73]
The pirate who had cut Z's arm off joined Shichibukai.

[Age 74]
Luffy beats Z.

Spoiler for Other small tidbits of info:

Z never killed his enemies.
The pirate who cut Z's arm off had been caputured by Z once, but he had managed to run away praying for his life. He had told Z that he had family.

Oda says that Luffy won the fight because Z was "former" Admiral.

So it looks like the shichibukai that cut off Z's forearm wasn't Doflamingo after all. It's one of the new shichibukai that was recruited over the time-skip. Now I'm really intrigued to see who this guy is in due time. And we've finally got the ages of the admirals. Kizaru is now 58, Akainu 55, and Aokiji 49. I didn't expect Z to be Whitebeard's age. Sure he's an old timer, but I expected him to be 70 tops. Clearly the man was well past his prime, as his history indicates during his last years.