A perfect body is also defined by the mesomorph body type. Which type are you?
Mesomorph, Ectomorph or Endomorph?
Most of these perfect bodies seen on TV and in magazines are most always mesomorph body types. As we age, they can change, of course.
It's best to do what is good for your own body type, as you can't force a non-mesomorph into a mesomorph. Anyone can be in good shape with the proper diet and exercise. And that also means no bad habits such as smoking, drugs, etc...
A good diet is plenty of good organic fruits and veggies. Meats, eggs and dairy must be free of steroids, antibiotics, etc... For instance, eggs and chicken are free range and must say on the label.
Regarding stretched out skin, that's a collagen and elastin issue. There is supplementation for that such as colloidal minerals that contain copper. Need at least 2mg of copper daily. The skin will tighten. Also selenium and tin in those minerals. Yougevity has a good brand and so does Drucker Labs (called IntraMax and IntraMin) You can do a search on those. Amazon has them. Daily copper from colloidal minerals also help in turning hair from grey back to original color. Dr. Joel Wallach, the founder of Yougevity has brown hair, not grey.
G-5 organic silica by Orgono is good as well as Biosil. There is LOTS online about those two silica products. Biosil is on Amazon, and you can read the awesome customer feedback on that. There were claims about how much skin improved after about 3 or 4 months. Alot also said it helped their hair growth. Just look it up on Amazon. Most take it for bones, joints, etc... too. We take the G-5 and already our skin is looking better. Both of us.
Systemic Enzymes and Amino Acids are also good for the skin. Platinum Plus Amino Acids, and Vitalzym. Lot of companies online has those, including Amazon.
There are lasers and things to help shrink the skin itself. Titan, Thermage, and LipoEx to name a few. Just about every city has a MedSpa of some sort now.