Answer:
Iām tall when Iām young. Iām short when Iām old. I can light up your world. What am I?
I am seen in the water. If seen in the sky I am in the rainbow a jay's feather and lapis lazuli.
I begin and have no end. Eventually I will be the end of all that has begun.
I run around the streets all day. Under the bed or by the door I sit at night never alone. my tongue hangs out waiting to be fed during the day.
I belong to everyone. Sometimes make you happy sometimes make you sad. I will never end until the day you do.
Give it food and it will live, give it water and it will die.