I heard from one of my friends that half of current Brahma's time is passed, is that true?
How much time has been passed of current Brahma?
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Yes, that's true as per Chapter 46 of Markandeya Purana and Chapter 5 of Kurma Purana.
As per Chapter 46 of Markandeya Purana,
For a hundred of his (Brahma's) years is denominated a Para; and a Parardha or half a Para is well-known to be composed of fifty years.
So then a Parardha of his life has elapsed, O brahman; at the close of which occurred the Maha-kalpa, which is famed as the Padma.
Of the second Parardha which is now passing, O brahman, the first kalpa (or cycle) ordained is this one called the Varaha.
Sanskrit verses and Hindi translation of Chapter 46 of Markandeya Purana can be found here.
Lord Brahma's life-span is mentioned hundred (100) years (in which day is known as Kalpa). Lord Brahma's 100 years are known as Para which is his life span.
And Parardha or half a Para is of fifty (50) such years. In another words, Lord Brahma's life-span is of 2 Parardhas.
And at the end of Padma Kalpa (previous Kalpa), first Parardha got over i.e. half life span of Lord Brahma got completed.