Question

How to be immortal ?

Answer 1

Biologically immortal is perhaps not possible. We could follow the way of life that sages in India lived long ago. That natural way of living enabled a long life duration.

Stop ageing of body cells, organs by consuming natural pure food, water, vegetable juices or fruit juices. Breathe in pure fresh air. Control emotions and be cool. Follow healthy habits.

Reduce breathing speed or frequency, reduce the heart beat rate. That reduces ageing.
Reductions in metabolism reduces energy produced, but for long life one should not strain oneself too much.
Reduced metabolism is important.
Do meditation, and yoga. Talk less. Follow a disciplined style amidst natural environment. Living in cool places and forests helps long life. Too hot or cold temperature affects the body.