The only thing having innocence at my age would mean is that I am mentally retarded.
I would never give up my understanding of the world, nor the intelligence and experience I have gathered over my life, to go back and experience ignorance again.
Do you know what you would want when you reached your destination of innocence? To lose that innocence. Like all children, you would want to grow up.
You would want the very knowledge and experience of life you are willing to trade to be innocent again.
No one appreciates being innocent when they are.
The only way you could ever truly appreciate being innocent is with the foreknowledge of looking back in retrospect, or viewing the innocence of childhood, and bringing that with you. But even then you would not be innocent as you would know what awaits you in the world.
You can still find wonder and awe in life as an adult.
There are plenty of things in life left to discover.