There's lots of videos like this it's not a misunderstanding of their own scripture.

https://www.chabad.org/library/bible_cdo/aid/8220/showrashi/true

https://image.nostr.build/2d12e7c9d03946cf4dc626ca3c27607d1fa7e6540d098ad16c31b73334682b2f.jpg

This makes Isaac thirty-seven years old, and at that time, Rebecca was born. He waited for her until she would be fit for marital relations-three years-and then married her.