Totti celebrated his 37th birthday last week.
Garcia said: "As I've already said, he's not only an immense player, but a wonderful human being. And he's also humble like all great players.
"Before arriving here I knew the player and the superstar - everyone in football knows the captain. But Totti is a great person too.
"I'm happy he's extended his contract. People usually talk about players being legends once they've retired, but Francesco still has the chance to write his own legend. And I hope to do it alongside him.
"It's how old you feel that's important, not the age on your passport - that's why Totti's still young."
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