How to fake data based on the condition and weight

I'm trying to fake data for the coffee shop. I've two features age and menu. Menu includes various type of drinks such as coffee [latte, espresso, mocca, etc], tea [milktea, lemontea], milk [freshmilk, matchamilk, etc]. What I'm trying to do is to fake menu based on the age like if the age is higher than 15, 80% of people who has the age higher than 15 will mostly order coffee randomly from the list of coffee [latte, espresso, mocca, etc], 20% will order milk and tea. Any idea on how to do this in the python?