Rekindle an old friendship......?

Basically there is this guy in school who is a year older than me. We used to be really good friends and he'd come to my house sometimes as my mum is friends with his. About a year ago we drifted apart and our friendship wasn't the same. Now it seems as though he feels really nervous around me and conversing with him is very difficult.. I know things always change as people grow older but I can't help but miss the days when we were friends..... Is there any possible way for us, even if it was not the same as it used to be, to be friends again???