Telomere length refers to the length of protective caps located at the ends of chromosomes. These caps are made of repetitive DNA sequences and help prevent the chromosomes from deteriorating or fusing with each other. As cells divide, telomeres shorten, which is a natural part of the aging process. Shortened telomeres are associated with various age-related diseases and conditions, including heart disease and cancer. Researchers study telomere length to understand its role in cellular aging and its potential impact on overall health and longevity. Maintaining healthy telomeres may contribute to better health as we age.