Creativity takes many forms. Rather than thinking of the output, I believe creativity is a state of mind, a conscious desire to be different, unique and original. You want to be known for what you create, not for what you can reproduce.
When I attempt to draw, others can tell the age when I stopped drawing regularly (it was about 10). Your ability to draw reflects the age you stopped drawing, or more correctly, when you stopped practising. It is only through regular application that you understand the artistic skills that you have, how to improve them and work to improve them.
Creativity is a muscle. Physical muscles need to be regularly used otherwise they weaken; it can be very painful to reawaken and strengthen a weak muscle. The only way to develop a muscle and make it strong is to exercise it.
To be creative takes effort and practice, lots of practice. Everyone can be creative, it comes down to desire and will. Maya Angelou, the American author, poet, dancer, actress and singer, says it best:
“You can’t use up creativity. The more you use, the more you have.”
Do you need any more reasons to be creative?