The difference in age between new Superman actor David Corenswet and DCEU star Henry Cavill explains the direction Superman: Legacy is headed in. Cavill went through a rough patch in the role in the old DCEU, with the actor only getting one solo movie in the role, and last playing Superman in 2017's Justice League before returning for a cameo role in 2022, appearing in Black Adam's post-credits scene. The moment was meant to start a new age for Cavill in the role, with the actor taking to social media to celebrate his Superman return. However, a few months after Cavill's return, James Gunn announced that the actor was out.
https://screenrant.com/superman-legacy-henry-cavill-david-corenswet-ages/