How old are they supposed to be?

She mentions she has a Masters in Macroeconomics, so considering 15 is the age when she passed out from high school, she could be something around 18-19 and he could be a year or two older. Just a guess.

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Early 20's.

People who go to university in France typically graduate highschool at 18. A masters degree takes 4 to 5 years, except she dropped out, so she'd be around 22.

Him, it's not clear, he's at least 18 otherwise he wouldn't be ordering a beer in a bar. He doesn't talk about school , so would guess he's a year or 2 out. So let's say 20.