This is what wiki says;
Daniel Martinez claimed in a 1998 article in Experimental Gerontology that Hydra are biologically immortal. This publication has been widely cited as evidence that Hydra do not senesce (do not age), and that they are proof of the existence of non-senescing organisms generally. In 2010 Preston Estep published (also in Experimental Gerontology) a letter to the editor arguing that the Martinez data support rather than refute the hypothesis that Hydra senesce.
The controversial unlimited life span of Hydra has attracted the attention of natural scientists for a long time. Research today appears to confirm Martinez' study. Hydra stem cells have a capacity for indefinite self-renewal. The transcription factor, "forkhead box O" (FoxO) has been identified as a critical driver of the continuous self-renewal of Hydra. A drastically reduced population growth resulted from FoxO down-regulation, so research findings do contribute to both a confirmation and an understanding of Hydra immortality.
While Hydra immortality is well-supported today, the implications for human aging are still controversial. There is much optimism; however, it appears that researchers still have a long way to go before they are able to understand how the results of their work might apply to the reduction or elimination of human senescence.
It means immortality is a possibility. If it is possible in nature, then it is possible in science. Which then makes it possible for us to theoretically, live forever.
The question is; would YOU want to live forever?
It’s funny, but I don’t think I would. It would be nice to regenerate damaged parts, but I would want an expiration date. I think 200 years would be tops for me.
I believe a person could become very tired, bitter, easily irritated, and bored because of the somewhat predictability of life. Though in hindsight, it could be good for the Earth because people will start thinking of living on the planet for more than (80) years and start taking better care of our planet.