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January 17, 2014 (CNN) - Facebook started as a social network for college kids, and it really took off from there.

But now, it may have reached a saturation point among that group. A new study shows teens are turning away from Facebook. So who is liking the social network these days?

Facebook might be more for grandpa these days, and junior is turning away.

The social network was once a hallmark site for teens and young users, but now, Facebook seems to be falling out of favor with that age group.

A new study from I-Strategy Labs said that over the past 3 years, the number of 13 to 17-year-olds on Facebook plunged 25 percent. Also falling? The second-youngest age group, 18 to 24-year-olds.

And look at who's logging on...baby boomers.

The growth among the 55-and-older group has exploded up to 80 percent in the past 3 years!

It's not a huge surprise. Facebook's CFO said in October that it saw a decrease in teenage daily users during the quarter, and the stock plunged that day.

But not all experts are worried. One analyst said Facebook can recapture those young users.

The company is trying to do just that. It bought Instagram a few years ago, a site that's growing in popularity among teenagers.

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