[Telomeres may get longer](https://www.ucsf.edu/news/2013/09/108886/lifestyle-changes-may-lengthen-telomeres-measure-cell-aging) if people pick up better eating, execrising, stress management and social support. So it may be hard to tell how long someone has left since they could have a period of time where they slow down, stop or reverse the aging process.
Latest Answers