SB 12.2.11

triṁśad viṁśati varṣāṇi
 paramāyuḥ kalau nṛṇām
Synonyms: 
triṁśat — thirty; viṁśati — plus twenty; varṣāṇi — years; parama-āyuḥ — the maximum duration of life; kalau — in Kali-yuga; nṛṇām — of men.
Translation: 
The maximum duration of life for human beings in Kali-yuga will become fifty years.