What is the right age for spirituality?

Is Krishna telling Arjun, “Arjun, you come to me after fifty years when you are about to die”? Is that so? Or Guru Vashishtha of ‘Yoga Vashishtha’ is telling Ram, “Ram you are too young to receive this revelation. Come to me when you are half-dead.”?

Spirituality of old age is merely repentance, it is not Spirituality.

And what are you repenting?