For anyone concerned about their beverages. Following is a table of Recommended maximum daily intake of caffeine according to different age groups & categories: https://www.canada.ca/en/health-canada/services/food-nutrition/food-safety/food-additives/caffeine-foods.html

FDA’s recommendations: https://www.fda.gov/consumers/consumer-updates/spilling-beans-how-much-caffeine-too-much

For measure: 8 oz (227 g) of Coffee has 80-100 mg of caffeine or 35-45 mg of Caffeine per 100 g of Coffee. (Average, numbers may vary accordingly.)