In Germany we have got an integrated system with small pockets of protected forest inside leger forests. However, in opposition to most of the world, we don’t do clear cuts or the like, except for big calamities. we would usually fell single trees inside a forest and have the others left over for a later date or generations. You can get a year old sapling next to a 300 year old oak and everything in between right next to each other. Naturally due to historical over use, we haven’t got any old growth forests like in Ukraine or Poland, but we certainly preserve our ecological functions.