Board Thread:Worlds, Servers, and Seeds/@comment-28905095-20160702133430

If I created my world in an earlier MCPE version, say 0.14.3, is it still possible to find a Jungle Temple which was added in 0.15.0?

In other words, when a world is generated is it a fixed creation or will it possibly be updated when upgrading versions of MCPE? Does this upgrades only affect undiscovered terroritories in that case? 