It is undeniably Christmas time, as evidenced by the decorated houses, Christmas tree lots popping up and Santas setting up shop in department stores and malls.

For many small children, Santa Claus is a big part of the holiday. Kids pose on his lap for photos, write letters will detailed gift requests and try to be on their best behavior to avoid the naughty list.

The big guy in red is a hot topic of conversation for those who celebrate and have little ones, which begs the question, when do you reveal the truth about the Santa myth? Do you tell your precocious 7-year-old the truth because she's no longer buying it and you are tired of lying? Do you reveal the truth to your 10-year-old so he doesn't get teased by his friends for being the last believer? Or do you simply let them believe until they come into the truth on their own?

How old is too old for Santa? Do you remember when you learned the truth about Old St. Nick? Share your thoughts in comments.