yad ardham Äyuá¹£as tasya
parÄrdham abhidhÄ«yate
pÅ«rvaḥ parÄrdho 'pakrÄnto
hy aparo 'dya pravartate
yat - that which; ardham - half; Äyuá¹£aḥ - of the duration of life; tasya - his; parÄrdham - a parÄrdha; abhidhÄ«yate - is called; pÅ«rvaḥ - the former; para-ardhaḥ - half of the duration of life; apakrÄntaḥ - having passed; hi - certainly; aparaḥ - the latter; adya - in this millennium; pravartate - shall begin.
The duration of one hundred years in the life of BrahmÄ has already been discussed in many places in this work, and it is described in Bhagavad-gÄ«tÄ (8.17) also. Fifty years of the life of BrahmÄ are already over, and fifty years are yet to be completed; then, for BrahmÄ also, death is inevitable.