Hollywood type aliens...probably not. Some kind of "life form"....absolutely. Maybe even more advanced then us, being there are older galaxies and even stars in our own galaxy that are older, someway or somewhere there is life beyond Earth. Someone has to be really closed minded to say "no".
yes there are aliens in the sense that there life because there is so much out there we haven't seen. There are as many galaxies as there are grains on sand on earth or probably even more each containing like a million or billion or trillion or even more solar systems in them. So, according to me there is definitely life out there. Humans take things the the best they suit. For instance say there is a table in a room and a lady in the same room. the lady goes out for a minute and come back. By that time the the table could have gone out the window somewhere and might have come back just before the lady enters without anyone noticing it. But it is easier to think the table was stationary which best suits the situation. So that is the reason many people think there is no life out there