He may or may not change his mind, but it is best to let him go if that is what he truly wants. You really wouldn't want to pursue something that he is not sure about then 10 years from now have him separate from you. It would then be much more difficult for him to move on. Even though it may be hard for you now it may be the best thing for both of you. Just be his friend and see what happens if it is meant to be it will be. I wish you all the best!
It all depends on his feelings and how strongly against the age difference he feels. Love usually outweighs obstacles. If his feelings are strong for you then you both could come back together, but if he feels that the age difference impacts your relationship then he may choose not to go further. Communicating with him is the best way to find out the outlook for the future. That will help you see if indeed there is a chance.