I think you can absolutely train him, age doesn't matter. The fact that he's in a new home means that you are essentially already training him to become adapted to your new home and surroundings, bed time, etc. which means you can train him to get used to your yard and hanging out in it.
I would start practicing recall. Every time he comes when you call him, you give a treat. Start doing this inside the house or a fenced area, then gradually practice outside, or with a long line.
@Ellie_dog 's Mom
~My dog makes me smile at least 20 times a day~
Proud supporter of pet shelters, pet seat belts, and
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