am I in love?

There's this boy who is my best friend. We've been hanging out almost every day for a few months now. I cannot shake this feeling. I don't feel right when he's not around. Like, even when he's in a bad mood I'm happy to have him next to me. I love taking care of him and I love when I have his attention. I would literally do anything for him. I've had these feelings for over a year now but I'm afraid to tell him. Is this love or am I just obsessing over him? I've only just turned twenty and he's almost twenty-seven. Is he too old for me? Am I too young to have these feelings? What is wrong with me???