Guy's Behavior

Is he interested and is he too young?

I had to delete a bunch of text cuz of limitations. was much more detailed. But this is what I can post - this is a gym scenario

first - I am using a machine and he comes up to ask how many sets I have. I tell him I have 3 more sets and asked if he wanted to work in with me. he politely declines and says he's with somebody and he wants to workout with him, and for me to take my time. (but he was super super polite) I say okay, try not to become red cause he sat right next to the machine next to me. (here's a detail, he never does that ever or we just dont use the same machine in the same day, he usually goes other places in the gym when he's alone, Im assuming he got a vote of confidence cause his friend was near or maybe he just decided to break the ice with me since we've done so many eye contacts in the past three weeks). So he's sitting next to me, his body facing completely towards me which he could've faced another way, either way I'm ok with it - but I can feel his eyes burning into my face, pretends to be on his phone. so I get up and change the weight and tell him I have one more set, he smiles teeth and all with a thumbs up of acknowledgment and says to take my time. 2nd. Im doing cardio and he's coming up to leave and I waved my hand to which he smiles to and I say can I ask a question? he asks what's up? I ask how old he is - sadly he says he's 21 and I am shocked , he can see it on my face and smiles at me, again with teeth. then I asked for his name, he told me and he asked me what my name was and this time he came around to be near me, I told him my name and I think he wanted me to reach my hand to say nice to meet you but I took my AirPods out and just told him it was nice to meet you like an idiot. he stood there for a couple of seconds, I got shy and had no more questions in me cause I wasn't sure what to say. we've never spoken and to my surprise its been twice in one week. Is he interested in me too? and is he too young for me? 15 year age gap!

Is he interested and is he too young?
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