people are always talking about ‘ the problem of youth’.
Are talking _ 到目前为止一直讨论
‘the problem of youth ’ 加引号，英文用单引号引用。
-which I take leave to doubt 插入语结构 “我冒昧的说”，表示怀疑
-If there is any,(如果有的话)同样表示怀疑
straight forward 开门见山
it is older people who creat it.—强调句
People are always talking about' the problem of youth '. If there is one—which I take leave to doubt--then it is older people who create it, not the young themselves.