Immortality is eternal life, being exempt from death; unending existence.

Can immortal man die?

He can share his immortality but not his invulnerability to harm, meaning those he bestows with power are untouched by age or disease (the traditional definition of immortality) but can still be killed by physical damage or other outside factors.

Who is immortal God?

The above lines mean that by daily remembering these 8 immortals (Ashwatthama, King Mahabali, Vedvyasa, Hanuman, Vibhishana, Kripacharya, Parashurama and Rishi Markandaya) one can be free of all ailments and live for more than 100 years. These are also referred to as the 8 great warriors.