To avoid the danger of wasting human life and to become attached to illusions, one must, from the age of fifty or even rather, become aware of the approaching death. It is therefore necessary to prepare for it for a better future life. In other words, it is a matter of detaching the mind from material concerns and fixing it on the Lord.
We must surrender ourselves to God, and serve him with love and devotion. Only this path, simple after all, will be able to lead us towards the highest stage of spiritual perfection, towards God, in his absolute and eternal kingdom. The highest perfection of the human being is to remember the Supreme Lord at the end of his life.
In other words, one has to shape his existence in such a way that gradually the remembrance of Krishna, God, the Supreme Person, marks each stage of our life.
The Supreme Lord says:
So in My personal form always absorb your thoughts without failing. Dedicating your actions to Me, turning your mind and intelligence to Me, without a doubt you will come to Me.
He who always remembers Me, the Supreme Lord, and meditates on Me, without straying from the way, that one, no doubt comes to Me. We must meditate on the Supreme Lord as Omniscient Being, the oldest, the Master and the support of all, who, even more tenuous than the most tenuous, is inconceivable, beyond material intelligence, and always remains a person. Resplendent like the sun, He transcends this world of darkness.
Who, at the moment of death, fixes between the eyebrows his vital air and, with the deepest devotion, absorbs himself in the memory of the Supreme Lord, will go to Him.
Thus established in yoga [the practice of union and communion with God], and pronouncing the syllable Om [spiritual sound vibration], supreme alliance of letters, the one who, at the moment to leave the body think of Me, the Supreme Person, that one, without a doubt, will reach the spiritual planets.
Because constantly absorbed in devotional service, the one who always remembers Me, without deviation, reaches Me easily. When they have reached Me, the spiritualists imbued with devotion, these noble souls, having thus raised themselves to the highest perfection, never again return to this transitory world where there is suffering.
All the planets of the universe (of the material universe), from the most evolved to the lowest, are places of suffering where birth and death follow one another. But for the soul that reaches My kingdom, there is no more rebirth (there is no more reincarnation on a material planet, the cycle of rebirths and repeated deaths comes to an end).