Just about everywhere from the day Star Wars came out in 1977. I remember all the articles, books, trading cards, comics, games, etc., all describing Chewbacca as a "200 year old Wookiee," though it looks like that is no longer official Disney-era canon. While his Wikipedia entry still includes this, Chewie's entry at https://www.starwars.com/databank/chewbacca does not mention his age.
All that’s non-canon though. Not that it matters, but AFAIK the only canon reference to Chewie’s age is in that trailer.
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