House training 8 years old dog

The question I have is concerning house training an older dog. My dog is 8.5 years old and has been living outside ever since he was a puppy since at the time I lived in a house. Now that I'm moving, I'm considering taking him with myself, rather than leaving him with my parents, however, I will be living in a spaceous apartment with a balcony. Is it possible to expect to train a dog of his age, especially potty training? I would be able to walk him if needed twice a day and there'd be an access to a nearby park.
   
Thank You in advance.

Any dog can be housetrained, no matter how old.
   
Housetrain the dog like a puppy; start from scratch.
   
There are articles on the web & books. Also call your vet & ask if they can recommend the best way to do this.