Expected hair distribution changes in older adults include:

a. increased terminal hair follicles on the scalp.

b. more prominent axillary and pubic hair production.

c. more prominent peripheral extremity hair production.

d. increased terminal hair follicles to the tragus of men's ears.

Expected hair distribution changes in older adults include increased terminal hair follicles to the tragus of men's ears (option d).

Explanation:

Although the causes are unclear, the appearance of ear hairs and tragus is a male and age-related trait, as they usually appear after the age of 30.

One possible cause is the increased sensitivity of the hair follicles in the ears to the hormone testosterone. The appearance of these hairs in the ears is usually very dark, thin and long.