Well, the movie doesn't give an exact age for the old man. But from what we see, he seems to be in his late middle age, maybe around 55 or 60, judging by his looks and actions.
It's difficult to determine exactly how old the Christmas story is. It has evolved and been passed down through generations, with elements added and changed over time.
There could be many old pictures related to 'A Christmas Carol'. Some might show the main character, Ebenezer Scrooge, in his counting house, looking all miserly. Others could depict the ghosts that visit him, like the Ghost of Christmas Past, which might be shown as a glowing figure leading Scrooge through his memories. These pictures help bring the classic story to life visually.
In some Christmas stories, there could also be an old wise man. For example, in the Nativity story, the three wise men were on a journey to find the baby Jesus. They were older, wise, and brought gifts of gold, frankincense, and myrrh. They are important characters in the religious Christmas narrative.