What term describes the process of growing old?

The term that describes the process of growing old is “senescence.” This word is derived from Latin, where "senescere" means to grow old. Senescence refers to the physiological decline that occurs as organisms age. It encompasses a range of biological processes and changes that contribute to the overall aging of an individual, which can include cellular aging, the deterioration of organ systems, and increased susceptibility to diseases. This term is widely used in gerontology and other fields that study aging, making it the correct answer in this context.

Other options like sequestration relate to the action of taking something away or isolating it, semenology is not a recognized term in medical vocabulary, and sarapu does not have relevance in this context.