Bad news for those who were hoping to have a extraterrestrial encounter during their lifetime.
According to a recent study of the University of East England, there is little chance for intelligent extraterrestrial beings to exist, or even to evolve fast enough for a "human-alien" encounter.

The study is based on a mathematical model of probability and judging from the fact that planets which can support life (such as Earth) have a small period of opportunity for life to evolve and humans have "only" a billion more years to live, the chance for any humans to meet intelligent aliens is less than 0.01%.

In order for an intelligent life form to emerge we must first have single-cell bacteria, then complex cells, specialized cells, and so on.
Since intelligence is the last step in such an evolutionary process the odds of getting there are obviously small.

We are a good example in that sense: intelligent life on Earth appeared rather late( approximatively 100.000 years ago ) about 4 billion years after your planet met the conditions to support life.
Further more, if we consider that in about a billion years the Sun will begin expanding and shine brighter and hotter it seems that humans might not have a chance to tell their tale.