Is it okay for a 12 year old 4'10 boy who weighs 80 pounds to lift 5 pound dumbells?

Yes, it is generally okay for a 12-year-old boy who is 4'10" and weighs 80 pounds to lift 5-pound dumbbells, as long as he uses proper form and technique. It's important for him to start with light weights to avoid injury and to ensure that he is engaging in age-appropriate strength training. Supervision and guidance from an adult or a fitness professional can help ensure safety and effectiveness. Additionally, focusing on overall fitness and fun activities is essential at this age.