That's such a cute story o^.^o!
I think if you doesn't want to declare your felling directly, you can try to make him understand that you're into him by just having a big smille when you see him, tell him some kind words about his look or personnality. You can also let him understand that this is too bad you can see him for doing something,...
In fact you just have to try to by yourself and to express your feelling with your own words.
That works with my fiance, I just flirt with him and he declare by himself 1 month after we met.
Maybe he can be a little intimidate because you're older, so he may need more time to understand he really got a chance with you ^^