Opinion is divided on the role of Telomeres in aging though short Telomeres are shown to lead to dysfunction and disease. There is an opportunity to put the power of Telomeres to the test in people via AAV gene therapy a technology which has improved rapidly in terms of accuracy and safety and is available to us now.
Studies by M Blasco et al and others have indicated Telomere therapy can restore function to tissue but so far no one has taken this to the human model due to unproven concerns about Cancer. There are however studies that suggest optimum Telomere length in fact offers some level of protection rather than encouraging Cancer and that short Telomere's are more likely to lead to Cancer.
Studies by Shay and Wright also demonstrate that Telomere's regulate gene expression via the Telomere positing effect which leads to epigenetic drift as gene expression changes and silenced genes are expressed as they shorten.
Dr Helen Blau also this year demonstrated a technique that rejuvenated human skin and muscle Telomeres by about 10% in-vitro allowing them to resume division and continued function.
It is not the only factor involved in aging but IMO it has a key role to play in aging. The big question is should we continue to sit on the fence or should we take the step and try a limited test in-vivo to see if the beneficial effects seen in other animals apply to people too?