Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  
Search in Google Books:

1800 - 1945 1946 - 1949 1950 1951 - 1977 1978 - 2000 teen ager English
1800 - 1970 1971 - 1994 1995 - 1996 1997 - 1998 1999 - 2000 teenager English

Run your own experiment! Raw data is available for download here.
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