The phrase "already lived it" is correct and usable in written English.
You can use it to express that you have experienced something in the past, often implying a sense of familiarity or understanding.
Example: "When it comes to the challenges of starting a new business, I've already lived it, so I can offer valuable advice."
Alternatives: "have experienced it" or "have gone through it".
A lot of the dialogue that Cameron put in the mouth of his frustrated débutante, Rose DeWitt Bukater Kate Winslett), reminds you of Barbara Stanwyck's lines: "I saw my whole life as if I'd already lived it," Rose recalls, explaining her attraction to a carefree young artist named Jack Dawson (Leonardo DiCaprio).
From there on Genna never looks back, referring to a scene from Bullitt in which Steve McQueen says: "The future is now - we've already lived it". It's the right quote, fitting Genna's vision of conspiracy as the opposite of reason and enlightenment, of "conspiracy as metaphysics", and as the perfect metaphor for the way things are now.
Bebe Buell already lived it, in 1977, when she had a baby girl with three potential dads: Todd Rundgren, the rocker she was living with; Steven Tyler, one of the rockers she had slept with; and Mick Jagger, who had not bedded her around the time she got pregnant but who teased her about being the real father.
They've already lived it.
The progressive future belongs to them, because they are already living it.
I'm already living it," said Karl Brauer, senior analyst with Kelley Blue Book, an automotive research company.
Already living it, Hamilton said his first thought wasn't a concern for Washington's job or his career.
"We felt it was incumbent on us to let her try to get her dream, and at 14 years old, she's already living it".
More than likely she's already living it: that song was the most used track in adverts, video games, trailers, TV shows and films last year.
