Sense Sonnet - Pumper

Deep Sea Sponge

A long, long time I've been around,
Hanging out in the ocean deep.
Onto a rock my body's bound,
And constant water flow does keep
Me filled with food and oxygen,
While removing my waste away.
I can reshape me now and then
For new perspective, one might say,
Moving around jelly like cells
Which keep my good in and bad out.
It all works for me as time tells.
Life for this sponge - simple, no doubt!

So how old am I - can you guess?
Eleven thousand years old - yes!