Most likely, yes - if he was hatched real late in the year, like July, there is a little more of a chance he won't breed this spring, but it would be unlikely. My 1'st year ganders this year are 10 months old about and are already breeding the geese. I'm not sure when they will start where you are, but they are not like chickens. Geese are gentle, calm and you won't notice any signs until the gander starts mounting the goose. They are quiet and quick and you have to keep an eye out to notice them breeding.
Remember, geese are quite infertile in their first year, you will get some goslings just not as many as their second year - I'm not sure how your young gander will do with an old (mature) goose though, I will be doing that soon too and will be interesting to see how the pairings turn out.
