Describe grandpa in "The Half Husky".

From the text:

He was in his late eighties, but he walked straight, carrying his bulky body with an energy that was partly physical and partly sheer determination. His splendid condition, for a man of his age, he attributed to unceasing toil and good habits. He touched neither tobacco nor snuff, he spurned playing cards, and he based his drinking of only tea on the Almighty’s contention that wine was a mocker and strong drink was raging.