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My best answer is because...you get bigger so your body parts start to function and gets bigger or smaller to.
you can use scale model to measure proportions
Changing the proportions of substances in an alloy will change the physical properties of that alloy. The differing substances will change the metallic structure of the crystals of the metal alloy, and this alters the ductility, durability, hardness, tensile strength, toughness and other characteristics we assess are regards alloys.
Carbon-14 dating is the measurement of an object's age by comparing the amount of carbon-14 to the amount of carbon-12 and carbon-13 present in the sample.
Change of the body's momentum = (force on the body) x (length of time the force acts on it)
yes the body proportions change as you are growing older.
In RuneScape the size of any body part does not change with age. Even the size of the body does not change.
Circle graphs don't show change - just proportions.
Age structure
yes
age structure
This means that the different proportions are not the same. You could have different sizes or have the shapes change unproportionally.
Hopefully your body has finished to change (after puberty) at the age of eighteen. Look puberty for more, I guess
The size of your various body parts is the result of genetics and diet. Eat a nutritious diet and you will grow to your full size. Other than that, your body proportions will not change, and do not need to change. Your penis is big enough. Use it wisely.
fat stores up
Your hormones and the chemicals that your body produces naturally, change with age. This causes your needs for different nutrients to differ with age
Leonardo da Vinci wanted his paintings to look realistic so he had to know proportions.