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To best minimize your risk, consume less than 100 milligrams of caffeine per day, or no more than 1 to 2 cups of coffee. Caffeine may also have adverse impacts in children, such as disturbing their sleep, and intake should be limited to 2.5 milligrams of caffeine per kilogram of their body weight per day.
These numbers are derived from dietary survey data, so they are really a summary of how much people do consume, rather than how much they should consume. The range is quite broad: for men aged 51-70, a daily consumption of about 1.9 liters total is indicated, including the water present in all foods and beverages. For women aged 51-70, the median consumption is about 2.0 liters per day from all sources.