fasting has been shown in labs to contribute to longevity. well, technically it's dietary restriction, or done artificially a knockdown of the igf-r1 gene.  > muscle healing ratios this is a bit more complex than you imagine. it is 2fold. on the one hand you have senescence, which accumulates and then spreads uncontrolably, leading to tissue degradation. this can be adressed with drugs such as senolitics. but that speeds up stem cell exhaustion. you gain an inch, but you lose 3. on the other hand, you can try to increase telomer activity, which you mentioned, wherein you reduce stem cell exhaustion, but you increase your chance of cancer.  the problem with drugs is that they are a blunt instrument. what you need a more targeted approach. you need better telomer regeneration in stem cells only.  unfortunatly all of this fails to adress one of the more complex and central aspects of ageing, transposon activation. if you want to read up on this, i suggest the 2021 paper by gorbunova et al. 'the role of retrotransposable elements in ageing and age associated disease'. basically we all have a shitton of ancient, probably viral in origin, genes that replicate inside our genome. i don't know if i can put a % to it, but we are making decent, steady progress. as much as many of you dislike it mrna tech will be a godsend for this, especially if we manage to remove some of the dangers and side effects.
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