Jennifer Garner's Once Upon a Farm went public at a $724-million valuation — and she refuses to check the stock price

Jennifer Garner's acting career has seen her take on roles from secret agent to superhero, but one of her most memorable performances is that of Jenna Rink in 13 Going on 30, in which she plays a 13-year-old girl who magically awakens as a 30-year-old career woman.

At 54, Garner has also taken on the role of entrepreneur, and she says she's grateful that she has the life experience behind her to know how to be a "grown-up" in the boardroom.

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Garner spoke with Forbes Talks about learning the ropes in business as a named co-founder of Once Upon a Farm, her baby food company that went public this February with a valuation of $724 million. As of Aug. 20, its market cap was nearly $750 million (although Garner wouldn't know that — she never checks the stock price).

"I'm learning. This is all new to me. I'd never taken an econ class, a business class. I didn't know how to read a spreadsheet. They still really overwhelm me, but I sure as heck love the process of being the student in the room, always," Garner said in the interview .

Entrepreneurship at any age

Garner said that she sees being over 50 as an advantage in all aspects of her professional life — in her charity work, her acting work, and with her company.

"Because I'm more fully realized as a person, because I've been through things, and I've come out on the other side of hard things, and I can reflect back on myself and think, 'Oh, I have more empathy than I used to.' I have less judgment than I used to. I have a better idea of when to speak up than I used to — and when to stay quiet."

Speaking about the opportunity to work with the other co-founders of the company, Garner said that she is "so grateful to be a grown-up in that room and not a kid, because I think that I would think I need to prove myself, I need to say, 'This is how we should do this, or this is how this should run.' And I'm blissfully not motivated by needing to be in charge."

When asked whether she is checking the company's stock price daily, Garner was adamant that she is not.

"People say to me, 'Oh, I know you're checking it. You have to be checking it.' And I say, 'You underestimate my discipline,'" Garner replied.