I think children are the best at learning new things. Their brains are like sponges, soaking up information quickly. They're naturally curious and eager to explore the world around them. Plus, they don't have many preconceived ideas, so they're open to learning new things. This is especially true when it comes to learning languages, as they can pick them up quite easily at a young age.

Teenagers are quite good at learning new things too. They have developed cognitive skills that help them understand complex ideas. They're also motivated by their future goals, which drives them to learn more. Teenagers can think critically and solve problems, and they have access to a lot of resources that aid their learning. Their ability to grasp abstract concepts also improves during this time.

Adults can be very effective learners as well. They bring life experience to the table, which helps them relate new information to what they already know. Adults are often more disciplined and focused, choosing to learn based on personal interests or career goals. They have developed good study habits and can apply their knowledge to real-world situations, making their learning practical and relevant.