"Aside from both Indy and Marion having tendencies to leave randomly, their relationship is problematic. Marion’s appearance in Raiders of the Lost Ark reveals she's 25 years old. So, if the clock is turned back a bit to the point Marion and Indiana meet, she's about 15 or 16 years old and a decade younger than Harrison Ford's Indy. As mentioned, Indy woos her shortly after their meeting"

https://www.cbr.com/indiana-jones-marion-romance-age-difference-creepy/

http://web.archive.org/web/20221224074153/https://www.cbr.com/indiana-jones-marion-romance-age-difference-creepy/