How do we slow our personal telomere shortening rate?
There is a very strong negative association between chronic stress and telomeres. The worse the stress is and the longer the episode, the more your telomeres are impaired. If a woman is chronically stressed or had low emotional support in childhood, her kids may get shorter telomeres in utero. Social isolation also seems to be terrible for telomere length.
Disclaimer: Telomeres are a relatively new area of interest. Studies showing the above haven’t been replicated enough to be comfortably stated as fact. Of course, telling correlation from causation is difficult.