I estimate that, as of this week, 6 million of the 19.3 million #bitcoin mined have been irretrievably lost. (See related research at https://t.co/QMDa6tMh7v ) This means 13.3 million remain with only 1.7 million left to be mined over the next 100+ years. In that time, it's almost certain that another million will be lost, and old coins are being lost as new coins are being created. The 13 million circulating now is probably all you will have access to in your lifetime.