Wrinkles develop around the eyes and mouth. The dermis becomes thinner and the skin may become transparent and lost it's elasticity. Hair does not replace itself as rapidly. Decreased melanin production leads to gray or white hair.
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Not all physical changes are reversible because most times when such changes occur parts of the substance is lost to the environment.
Physical, because it doesn't change chemical make up it just changes the appearance and texture
slowing of metabolism, wrinkles, diminished eye sight
Physical changes of steel can include changes in shape, size, or state, such as melting, freezing, or reshaping through hammering or bending. Steel can also undergo changes in color due to exposure to heat or oxidation. Additionally, steel can exhibit changes in strength and hardness through processes like heat treatment or cold working.
Exothermic reactions release heat as they occur, such as combustion, oxidation, and some neutralization reactions. Other physical changes that release heat include processes like freezing, condensation, and deposition.