Ok, thanks! Of course it could be disputable. But, for example, I live in a “microdistrict” of city that was built starting from 1962 (some parts in 1980s) in a pine-oak forest, which was main natural vegetation everywhere around and still can be found nearby. In a corner of this “microdistrict” there is a group of oaks and pines aged 80-150, they growing not in the rows on the territory of the city park, school, music school, kindergarten and little bit around them. So it looks very much like they were growing in a (semi-)natural forest before 1960s and probably were not planted.