Final answer:
Sarah at 69 years old is categorized as a senior citizen, more specifically within the 'young-old' subgroup.
Step-by-step explanation:
Sarah, who is 69 years old, falls into the senior citizen age category. According to the various age classifications, especially those used in the United States, we recognize different stages within the senior populations: the young-old ranging from approximately sixty-five to seventy-four years old, the middle-old from seventy-five to eighty-four years old, and the old-old for those over the age of eighty-five.
As Sarah is within the sixty-five to seventy-four-year age range, she would be defined as part of the young-old subgroup of senior citizens, distinguishing her experiences and needs from those who are in the middle-old or old-old categories.