Cool plant. Was it grown from seed by you?
No, not at all.
I've been "doing" bonsai for three years and this tree is at least 10 years old.
In fact I got it as a present from one of my clients, and it was already in a good shape, and healthy.
I am just keeping it alive and refining the informal style, when I am not breaking branches wiring it too aggressively (its wood is brittle.)