Well but changing one's body composition depends on his/her background too, no? I am definitely not in the shape or physique I was when I was 20, 25 or even 30 but you would be surprised how "much" muscle is under the fat, bro lol. This is my starting point.
I will post again a photo in 8 weeks and you will not believe in your eyes (and I won't be using any supplements. Just cardio, lifting weights and healthy nutrition). If in 8 weeks I don't look like Bruce Lee then I have failed :P he he (I am kidding about the Bruce thing. I was never as skinny). Don't underestimate the natural built muscle of nearly 25 years under the fat bro. It will resurface one day :P he he he