There’s interviews from back in 1977 where even Harrison Ford, Carrie Fisher and Lucas himself state Chewbacca is about 200 years old. You can find these on YouTube. Many of the old EU concepts and planets and alien species and even some characters like Thrawn and the Chiss have been incorporated into the new definitive canon and I’m currently reading through some of my old Legends reference books and wondering how much do we know was also lifted to canon so far. It seems most of the corporations like Merr-Sonn, Blast-tech, Incom, Taim and Baks, Frie Tek, Czerka, Tagge co are canon. And even the planet Rakata Prime is canon which makes me wonder if the pre republic Infinite Empire and the star forge are canon too. What about the Noghri, Ysalmari, the Hapes consortium etc and what are the chances of the Yukazan Vong being transferred to canon in some form? The unknown regions has basically been already trailblazed in new canon by the first order but what about outside the galaxy? The concept of sectors outside the galaxy are referred to in attack of the clones with the rishi maze and beyond.