When language development refers, every child is a world. We have already commented on occasion that some children can not compare with others because everyone is different.
I personally do not like talking about concrete to develop skills you determine age because I think that depends on multiple factors.
What is clear is that the language may even affect the development of intelligence. In fact I discussed that topic in the post "How it affects the language to the intelligence of children and how to stimulate". Therefore, taking as a starting point what already said at the time, what today are going to give 10 specific activities to stimulate language.