What should I do

my crush is 17, turning 18 in september. meanwhile I'm 14, turning 15 in April

me and him are friends and we talk regularly. recently he did something and I asked around what it meant and I got the same response from every single person.

(this is what he did) the other day I was talking to some of my friends and he came to me and flicked my hood up. I was stunned, of course, so I asked him why he did that and all he said was "I don't know", then shrugged. I asked 10-15 people what it meant, and they all said he was flirting with me

I don't know if I should be concerned because of the obvious age gap, or happy because it's my crush and there's a possibility he likes me back