When you are in a relationship with someone who is younger than you, the expectations from a relationship or the idea of a relation itself will be different for the two of you. When someone is in their first relationship, they will lack experience and maturity as well. So in such cases you can provide the support to your boyfriend. But it will not be fare to expect him to proceed as fast as you want, right? And you yourself have admitted the fact. So I feel that you already know the area where efforts need to be put. Try to encourage your partner to speak openly about his expectations. Correct him wherever you can and for the other areas try understand things from his point and go along with that. Forcing someone to rush will not help the relation to work. So be patient with him, and always try to provide him the comfort and space so that he can share his views with you. And there has to be efforts from your end as well to slow down in some cases and move according to his pace.
There is no way that we can guarantee that a relationship will last or not. But if we can be sincere to the relation, put our efforts, love and care, we can surely make the journey worthwhile till it lasts.