I'm not going to allow a 3 year old to drink coffee
Why wouldn't you let a 3 year old drink coffee?
Because you shouldn't drink coffee as a child.
I totally agree.  Caffeine is an addictive substance and shouldn't be given to someone so young.  Good for you looking out for them!
It's all fun and games, I'm so serious in this.
It is good to know children's limits and stick to them.