I recently met this guy who says that he is 24 but when I went on his Facebook profile, I found that he was tagged by one of his friends in a graduating class that was not supposed to expected. This I found alarming. This made him about 10 years older than what he said he was. Also, I found that he wrote something on another friend's wall that he just got his first child and this occurred about 2 years ago. I asked him about it and he said it wasn't him and that it is a joke. However, I did not prolong the issue.
Whenever there is a party going on the campus that we attend, he will be the one that pays for me and buys me drinks. Also, whenever he wants to text me and I do not have minutes on my cell phone, he will buy it for me just to talk to me and he has been doing this for the past month now. We know each other for about 2 and a half months now. Also, we hooked up like two weeks ago and I was planning on not talking to him anymore, as I was turned off from him. This was because when we were going to a party he was telling me that he enjoyed the hook up for his friend to hear and I found this to be very immature.
I would really like to know if he likes me or he is just using me.

Time will tell what his intentions are. But if you have so many doubts and mistrust about him already, this does not bold well.

Just decide, whether you want to go with the wait and see approach or you just want to cut him out. Unfortunately, there's no way to find out instantly.

However, if you do go with the wait and see approach, I suggest that you keep a little bit of distance until you feel more comfortable before getting close to him again.

By the way, why don't you just ask him to show you his driver's licence to see his date of birth. If he really did lie about his age, then who knows what else he lies about. If he's a liar, then you're better off moving on from him.

One of the goals in a new relationship, is getting to know each other. Through friendship first, you learn about the potential boyfriend/girlfriend, and learn whether to continue, or whether it is not worth pursuing.

So what have you learned. Information such as he's probably 10 years older than he said he was, that he has a baby, and that you suspect yourself, that he is deceptive. At the very least you don't know if what he tells you is the truth, or lies. Is it more, or less important that he be honest in the beginning of a relationship, so you can build on trust? If you are already seeing clear signs that he is not who he says he is, who cares why he lied. The fact is, he lied.

If for some reason he wished to keep his history private, it was only private until you had questions about it. He has made a choice either to not tell you who he is, or to lie about who he is. Those are the only two options as I see it.

That he spends money on you should not be a reason to keep seeing him, if you have doubts and concerns. If he didn't have money and couldn't put money on his own cell phone, or yours, would you be giving this guy so much leeway?

If I were in your shoes, what I would do, is not look the other way and hope that what you have learned is just fake, untrue, or unfounded gossip. You have invested enough time and effort in getting to know him, that you should have some inkling as to whether the relationship is worth pursuing, based on what you know, and how you feel.

Only after you know the truth, and he is the only one that can give that to you, will you be able to make a decision one way or the other.