http://nar.oxfordjournals.org/content/early/2016/02/07/nar.gkw067.abstract
The above study makes little sense to me. However the authors mention that there may be an extra-gentic (or epigenetic) way to modify telomere length based on environmental factors.
If you watch this short video
Bruce Lipton's 1967 Stem Cell Experiment | CrossroadsFilm.com
https://www.youtube.com/watch?v=OAjJaYsaIDs&list=PLty-nUj7w26r8GHK9aixOPNFhiWbn7KYR
You learn about Bruce Lipton, and the idea behind epigenetics.