ultralights

im a 14 year old kid who loves to fly....my grandpa currently flyies a cessna 172.......i rewlly dont want to wait until im 16 to solo.....i was reading that yoh may fly a single seater ultralight aircraft that has no more than 5 gallons of fuel capacity at any age.....is this true? if ao whete could i fly one in the vacinity of dayton ohio.....or somewhere ithin 1 to 2 hours......please let me know if there is a different forum for this stuff.