Assuming that speed of light is the highest possible speed is a problem here. The distances we would have to overcome are simply too long.

I still hope that the assumption is wrong and that one day we might find a way to travel faster than light. Who knows.

Currently i have seen no evidence for the existence of aliens but the existence of water on other planets/moons in our solar system it would seem to indicate that life could exist on other planets.

And given the size of the Galaxy, it seems very probable life exist outside of earth.

Currently I don't believe in the existence of aliens and am not certain in that belief.

You already give the answer with your reason for there being other life, the universe is too freaking big.

It's very probable that simple life is common in the universe. However complex life might be a lot more rare and intelligent life even more rare. All that is true for earth's history. Life on earth has been around for 4 billion years, multicellular life for just over 25% of that, complex life for about 10%, intelligent life (in the form that left any impression on earth) 0.002% of that time. (The oldest man made structure, Adam's calander, is thought to be 75,000 years old) Any visible structures from space like the pyramids have only been around for about 5,000 years, we've only been sending signals into space for the last 80 years, with deliberately aimed signals in the last 40 years. (For example the Arecibo message, arriving in the M13 star cluster in about 25,000 years)

It might be possible to detect organic life on tons of planets, yet finding intelligent life at a comparable technological level, close enough to contact seems a lot more unlikely. Unless an intelligent species has access to near instanteaneous travel and communication and has send monitoring probes to every possible planet that has the capability of life, they simply would not have found us yet.

Yet for all we know as soon as we detect warp drive some smug star ship captain comes to congratulate us with an application form for a galactic federation. Congrats on not blowing yourselfs up so far, now here are the rules for space exploration... Nah don't think so.

Look up a googol or googolplex.

Whether there is life out there or not if we don't destroy ourselves we will learn to fully exploit DNA and design all sorts of life to survive different environments and gradually populate our corner of the universe. Sadly it seems when lifeforms develop technology it rapidly uses up the resources of a planet and probably leads to extinction in most cases. witness what the over population of man is doing to this planet.

At this point in time we really don't know how difficult it is to reach another star or how far we will have to go to encounter life with technology. It could be something like 500 light years away so even early radio messages are still a long way off reaching that civilisation and it will need another 500 years for the reply to come back.

We may be using the wrong equipment anyway. Perhaps the communication system between stars is based on some sort of particle that travels faster than light speed that we have not yet comprehended.

At this point in time we are like cavemen trying to work out how to get to the moon. We are just missing too many answers and most of the right questions too.

I wouldn't be surprised if there were multiple sentient species alive at the same time, but I highly doubt they would ever be able to contact each other.  Space is just too dang big!

no doubt about alien life. the question is about how complex life forms can get. Are they more powerful than us? (like superman?) and how big do they get, bigger than dinosaurs?

only as long as they won't find us

But haven't we been contacted before on numerous occasions?

Wouldn't the supposed alien abductions confirm our encounters with them? 

i guess it all depends on what you mean by "contact"

So what are you saying? You believe that Aliens exist? Do you believe that we have in fact made contact with them? maybe even more than just made "contact" with them?