Question

the portion of the skin involved in most age - related changes is the
o epidermis.
o subcutaneous.
o sebaceous glands.
o dermis.

Explanation:

Age - related changes in the skin mainly occur in the dermis. The dermis contains collagen and elastin fibers which lose their elasticity and quantity with age, leading to wrinkles and sagging. The epidermis has some age - related changes but less significant compared to the dermis. Sebaceous glands and subcutaneous layers also have age - related changes but are not the main portion involved in most age - related skin changes.

Answer:

dermis.