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Pics would probably help. A Sumatra that old would definitely be a bad specimen if he didn't have spurs growing by then. I think most roosters in general--regardless of breed--should be considered poor specimens if they have no spurs growing. But that is just my opinion....
When chickens have multiple spurs they tend to grow slowly, with exceptions of course. Your bird may be an extremely slow developer, spur wise. Or he is not of the mentioned age. Its possible that he is just a very slow developer.
Zach
Been raising chickens for, well forever, and have been raising large numbers of Sumatras for the past 10 years and I have never had a male not have spurs by the time they are a year old.  True, multiple spur birds typically have slower/delayed overall spur growth, but not that slow.  My birds will have at least 3 (up to 7) spurs on each leg and they will all be very noticeable by one year.  As a matter of fact, you can tell who will grow multiple spurs the day the chicks hatch and can cull for that at that time.  So in my flock, that bird would not make it to breed its first hen.