it was indicated that a particular doctor and acupuncturist from the Qin dynasty; Dr Cuie Wenze lived over 300years

300 years? wow it sounds a number very hard to achieve, especially because there were no modern medicine back them.

When it comes to our age limit, the ultimate solution would be to adopt synthetic forms for our future self, or like you mentioned "Cybernetic Immortality".

This would not only give us close to indestructible bodies, but also a way of achieving immortally by having infinite backups.

The possibility of prolonging our lives in virtual worlds also deserves some consideration.

I recommend you to watch 2 things:

1. the San Junipero episode of Black Mirror
2. A little known movie called "The Man from Earth". One of the best dialogue driven movies I have seen.

Cheers Hive account@samminator