Keep your eye on it, but this just sounds like the older dog needs some peace from the younger dog.
Imagine yourself exhausted from work and your 2 yr old nephew keeps coming at you to play -- jumping on you, pulling your eyelids up. I suspect you'd end up growling if lesser warnings didn't work.
And that is what you have to check -- if the growling doesn't work, the older dog might escalate his show of dissatisfaction. If, however, the younger dog stops immediately at the growl, there shouldn't be any problem.
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