jm 꾪=OD#rìw~|ÔÍÌ=ÛÐXàôýPëLEach node that stores the blockchain can decide when to prune old data, but there will be 'archival' nodes, that store all the data, all the time.
https://whatsonchain.com/tx/2fc58c1e0fa2c70a1268c50b0659df4e7488dbd51660d7e51a6e5c204a321704