Yes and in most cases this is normal and is nothing to be concerned about.
Many breeds of dogs can go through changes in the colour of their nose in line with the seasons, in summer their nose can become lighter and lose some of it’s natural colouring. In some areas this is called ‘snow nose’, it is often related to the time of year and is harmless.
Often noses that turn lighter in the winter will return to a dark colour when the weather turns warmer and sunny. For many dogs this is a perfectly normal event.
Old age can often be a cause of loss of pigmentation in a dog’s nose, just as he may develop some grey hairs around his muzzle, his nose can also change colouring as he gets older.