What is an appropriate term for a young person (child or teenager) whose words and actions mimic that of a much older person from a previous generation? Such a youngster would demonstrate strong nostalgia for the past, despite never having lived during that time period.
An example I can think of is a 12 year old boy who observes that, "children nowadays spend all their time with their faces glued to smartphones", or who prefers to write letters rather than emails, "like it was done in the good old days". This child would never have a Facebook or Twitter account, because they are, "silly fads of the 21st century".1
A possible phrase would be mature beyond his years, although that doesn't quite capture the characteristic in question—in particular the underlying contradiction, cynicism, and nostalgia.
I can think a perfectly fitting term from another language, but not English...
1The motivation behind this question is an interesting youngster I know who makes these statements!