What is recommended caffeine intake?

According to Health Canada's website, the daily maximum safe intake of caffeine varies widely. However, they recommend the following guidelines: General Population, healthy adults: <400 mg per day Women of child-bearing age: <300 mg per day Children: no more than 2.5 mg per kilogram of weight, on average: 10-12 years of age: <85 mg 7-9 years of age: <62.5 4-6 years of age: <45 mg.