Indiana Jones in 1969 is ridiculous.
The whole concept of the original character was based on pulp heroes of the 1930s. They should have just made a bunch more films when Ford was young enough or recast the role with younger actors and kept the 30s setting. Putting Indiana Jones in the 1950s and 60s is like putting The Lone Ranger in movies about WW1 or 1930s gangsters.
And yes, I am aware of the time travel angle.