I am working on a screenplay where the opening scene is that a woman has lost 20 years of relative age because of a "time machine" dynamic.
Then the play "flashes back" to a different time, where a 50-year old woman is flirting with a 30 year old man. And then one or more people comment that "if they were the same age..."
This is supposed to foreshadow the fact that the time machine dynamic will eventually make the two "age appropriate."
I've been told by any number of women that a romance in which the woman is 20 years older is implausible. But that the subsequent "equalization" of ages makes the story work.
So do I need to foreshadow the "convergence" of the two peoples' ages as described above? Or are readers/viewers smart enough to make the connection between the time machine, and the apparent age discrepancy without such help, meaning that I'm going too far? Is there any authoritative view on what is an appropriate amount of foreshadowing?