Thanks @agmoore2. As far her nurture and my reasearch is concerned I have learnt a lot about affects of stress during early childhood on rest of the life. And I keep telling anyone involved in taking care of her to be super careful at least during first 5 years of her life. Idk, maybe I am just a little paranoid.

Fat obviously worsens the situation. Excess fat is known to increase chronic low grade inflammation which would then accelerate ageing for sure. For the excess calorie been stored part is quite true, however, we also need to consider what makes up those calories. Not every calorie is the same and lead to equivalent storage of fat. I think I have mentioned this somewhere previously that we do know calories overall impact ageing but which calories are more important than others remains an open question.

If you look at the paper by Miguel et al., show significant decrease in short telomeres in all metabolically relevant tissue - liver, WAT and BAT. And decrease in telomere loss in these tissue seems to be significant in metabolic ageing. But yes you are correct, some needs to delineate impact of telomeres from metabolic context in these tissues.

Also, the whole calorie or fat impacting ageing is a complex nexus. While on one hand fat seems to accelerate ageing there is also an independent component of ability of cells to understand the nutritional state of body and respond accordingly.@valued-customer points out interesting pathways in this context in their comment. The low-energy state can push the cells towards maintenance mode. (But be careful when it comes to low vs starvation, starvation is detrimental).