The seven warlords of the sea, or shichibukai, are powerful pirates who have had their crimes and bounties absolved by the World Government, and now work for them.
At the time the manga starts, they are,
Juracule Mihawk,
Sir Crocodile,
Bartholomew Kuma,
Donquixote Doflamingo,
Gecko Moria,
Boa Hancock,
Jinbei.
After Sir Crocodile is defeated and his takeover plans discovered, he is dismissed from the Shichibukai, and is later replaced by Marshall 'Blackbeard' Teach.
At current manga timeline, Jinbei is in disgrace, but not formally dismissed from the role, due to refusing to aid the Marines in the war against Whitebeard. Blackbeard seems to have gone rogue, but his status has not been revoked yet either. Gecko Moria is also dismissed, since Donquixote Doflamingo with at least 5 Pacifistas were ordered to assasinate him. The reason is that the marines think that Gecko Moria is too weak to be a Shichibukai. Gecko Moria is currently in a unknown condition, and the marines consider him Kia in the Whitebead war. He is last shown severly injured and close to dying.
The newest shichibukai that are still active are:
Donquixote Donflamingo
Boa Hancock
Barthemelew Kuma
Dracule Mihawk
Only 5 are currently active. Gecko Moria is near dead, Teach resigned, Jimbe was revoked, and so was crocodile. Chapter 659 revealed that Trafalgar Law became a Shichibukai at some point during the time skip.
Boa Hancock is 31 years old during the events of the "One Piece" storyline. She was born on September 2, which is confirmed in the series. As one of the Seven Warlords of the Sea and the captain of the Kuja Pirates, she plays a significant role in the arc involving Luffy and Amazon Lily.
No he is not. The seven 'shichibukai', or 'warlords' are government-sanctioned privateers. An old aquaintance of Arlong, Jinbei, was one of the shichibukai until he quit. However Arlong himself was simply a pirate captain with his own personal fiefdom, bribing a naval official to look the other way.
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One famous classical - or rather, Romantic era - piece of music depicting the sea is The Hebrides (Fingal's Cave) Overtureby Felix Mendelssohn.
The tattoo is the kanji 'umi', meaning 'sea'.
A small piece of land in the sea is called an island.
One sea, many seas. It's perfectly regular. See, for example, the 'Seven Seas' range of healthcare products.
EP 312 "Thank You Merry! The Sea of Separation in the Snow"
It's my personal opinion that they may "hook up" in a since because Nami will just want to get one of Warlords of the sea, Hancock, extremely angry who is madly in love with Luffy.
A peninsula is a piece of land that juts out into the sea, and has two sides and one end. One example is the Malay Peninsula.
The seven belt loops signify the seven seas; The Adriatic Sea,The Arabian Sea, The Black Sea, The Caspian Sea, The Irish Sea,The Mediteranean Sea, and The Red Sea