He is 9 years old, as he is the same Link from The Wind Waker, who is also 9.
show them to the old wayfarer
In Phantom Hourglass, Link is 9 or 10 because in The Wind Waker (the prequel), Link is 9.
Phantom Hourglass is a direct sequel to Wind Waker and has the same Link. He is not much older than in Wind Waker.
get the swordsmen scroll
Oshus is the old man from the beginning of the game,or the "grandfather" of the fairy
He's a guy that wants the only mermaid in phantom hourglass then travels around in the seas
Give it to the Old Wayfarer (not in his hut but somewhere in the middle of the South East Ocean in a ship)
30-35.
28 years old. Here's a list of games in the series (except for those CDi ones):Legend of Zelda, 1986 Zelda II: The Adventure of Link, 1987 A Link to the Past, 1992 Link's Awakening, 1993 Ocarina of Time, 1998 Majora's Mask, 2000 Oracle of Seasons and Oracle of Ages, 2001 Wind Waker, 2003 Minish Cap, 2005 Twilight Princess, 2006 Link's Crossbow Training, 2007 Phantom Hourglass, 2007 Spirit Tracks, 2009 Skyward Sword 2011 A Link Between Worlds, 2013
No. Link is 16 years old in Twilight Princess. A child depiction of Link is featured in the following Zelda games: The Legend of Zelda (NES) A Link to the Past (SNES) Link's Awakening (GB/GBC) Ocarina of Time (N64) Majora's Mask (N64) Oracle of Seasons (GBC) Oracle of Ages (GBC) Four Swords (GBA) The Wind Waker (GCN) Four Swords Adventures (GCN) The Minish Cap (GBA) Phantom Hourglass (NDS)
no
bring it back to the old wayfarer, and he will give you a heart container.