isBiomarkerOfAging disease biological feature decline in stem cell function generated with ChatGPT version 4,0 on 19․08․24 The decline in stem cell function is a well-established feature of the aging process and plays a crucial role in the overall degeneration of tissues and organs as we age. Stem cells are responsible for tissue regeneration, repair, and maintaining homeostasis in the body. As we age, the function of these stem cells diminishes, leading to impaired tissue repair, reduced regeneration capacity, and an increased risk of age-related diseases.