Probably not a good idea. One could easily die, I suppose.
Especially if it includes their poison tenticles. Not sure about the main body though.
Besides which, ingestion of long-lived species apparently does not transfer their longevity to the "eater" anyway.
Mammals have already been de-aged in the laboratory.
Estradiol activates your telemeres lengthening mechanisms. Its found in milk, beans, soya and some other foods. Its also found in many contraceptive pills and levels are higher in women than in men (thats why they live longer).
I recommend a pint of whole milk per day for the rest of your life. If you're young now you'll make it to 200 so long as you dont go obese.