Bitcoin is 16.31 years old.
Bitcoin's genesis block has a timestamp from January 3, 2009 at 2:15PM EST.
The block included the text "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks".
The second block's timestamp was January 8, 2009 at 9:54PM EST.
The 5th halving will be in 155,764 blocks, around Thursday, April 13, 2028, and the block reward will be reduced from 3.125 to 1.5625 bitcoins.
"I'm sure that in 20 years there will either be very large transaction volume or no volume."
Satoshi Nakamoto