The icon above is Russian in origin and dates to the 18th century. It depicts the various stages in a man's life as a triangle. According to this icon a man reaches his prime of life, or at least the top of the pyramid of his life, at the age of thirty-five, after which there is a descent into old age.
Since today is my 35th birthday, I find this to be an excellent reminder of where I'm at in life, though it appears its all downhill from here. ;-)
Note: If anyone knows more about this icon, or at least can read the writing, a rough (or complete) translation would be appreciated.