What's the minimum recommended age for drinking a coffee? Is there any minimum recommended age for drinking a coffee?

In example for ground or instant (in case there is any difference)? I would assume there are no limits for a decaf coffee?
In short: there is no minimum recommended age for drinking coffee, but on the other hand it's not good idea to have kids drink coffee all day long.

It is discussed in depth in the parenting site of Stack Exchange and the top answer thee states:


  The bottom line is that caffeine is generally safe, but it does have significant effects in children as well as adults. Note that children are much more likely to encounter caffeine in a soft drink than in tea or coffee; that's what you have to worry about, I think, not Starbucks. A cup of green tea contains ~15-25 mg of caffeine, which is around the limit where there were no noteworthy affects for a 50 kg child, so if they want to hang out at a cafe, they don't even have to limit themselves to strictly caffeine-free options


Personally I'm not going to allow my children to have coffee before they are in highschool - that's the age where they can start to decide on things affecting their health.