The answer is simple: Everybody. Every man, woman, child, and senior citizen is familiar with coca-cola probably because they consume it themselves or consume a variation such as diet coke. Coca-cola is more than a soft-drink, its a national past-time. It’s been around for more than 100 years and those who originally drank it for it’s tonic properties provided by cocaine as an ingredient would still love it even without the chach.
I think your question pertains more to how coca-cola markets itself to different cultures and generations, but that’s a history lesson that cannot be provided here. Coca-cola targets everybody who is able to drink and enjoy soda, save for diabetics or those who don’t drink soda for health reasons.
Have you ever had a fanta? Coca-cola inc. manages the fanta brand and it started during world war 2. Nazis loved coke just like anybody else but the company couldn’t afford to be seen as a beverage for the enemy so they developed Fanta and sold it to Germans just to not have to turn their back on market. In other words, they fucking know exactly who they are, what their product is, and that everybody it won’t kill can enjoy it even occassionally.