Here is an article from the Huffington Post:
This Dutch study of over 2000 people proved an association between depression and short leukocyte telomeres and found taht after controlling for other factors. The literature in this regard is mixed but there are plausible reasons for this which I explored in thjs, my 19th Podcast. Interestingly, most people report a subjective improvement in mood after just three days of taking a telomerase activator.