Bitcoin is 7.40 years old
has been running and the blockchain has been growing since January 3, 2009 at 2:15PM EST, when the genesis block
The paper, Bitcoin: A Peer-to-Peer Electronic Cash System
, was published on October 31, 2008 at 2:10PM EST.
The 2nd halving will be in 6,204 blocks, around July 10, 2016, and the block reward will be reduced from 25.0 to 12.5 bitcoins.