Answer:
Basal forebrain region.
Step-by-step explanation:
Aging is the natural process of getting older and all organisms has to undergo the process of aging. The shortening in the telomere length and reactive oxygen species is involved in the aging process.
The biochemical changes of the body get slows down and individual has low energy stored in their body. The neuron loss is common that result in the loss of memorizing power with aging. The neurons of the basal forebrain region gets destroyed during the aging process.
Thus, the answer is basal forebrain region.