The location of the old man is as shown in the above picture: there is a V-shaped stone forest directly above the map, and there is a gap between the lower end of the V and the upper right corner of the V to enter. By the way, there are many ginger and important materials on the left upper end of the V-shaped stone forest, which can also restore health values.
There is an old man next to a tree at the left end of the V-shaped stone forest, who approaches to feed water and triggers a hidden task. Note that after you feed the old man with water, your bowl will be gone. You should make another one, and so will the dog. The dog is in the upper right corner of the map. It is suggested that you go to the top of the map first and then to the right, because there will be wolves not far from the right and they will bite you during the day.