Out of most of the hostels I looked at on hostelworld.com I found the minimum age to be 16. At least in Europe. Most don't list limits at all. You should be fine. You will be hard pressed to find a hostel with empty beds that will turn away money based on age.
"To Alcohol! The cause of--and solution to--all life's problems." -- Homer J. Simpson
"I didn't get to where I am today worrying about how I am going to feel in the morning." -- Ron White (Blue Collar Comedy Tour)
"I was born to lose and destined to fail." -- Mike Ness, Social Distortion
"Eat healthy, exercise daily, die anyway" -- My motto
"Everyone I know, goes away, in the end...I will let you down, I will make you hurt..." -- Johnny Cash (NIN Cover of "Hurt")
I am traveling around the world until I find something that makes me want to stop. I am an aspiring photographer and hope to find whatever it is I am looking for...