Act Like a Child - There is a popular theory that believes that children are better learners as compared to adults. That directly implies that it is because of age. While the theory is correct, the reason behind it is not.
Find a Partner - The best way to learn is by finding someone that is going through the same journey as you. Learning with a fellow learner also gives you a chance to discuss things that confuse you.
Listen Carefully - Listening is the best way you can acquire a language. Listening also improves your pronunciation. You can also watch movies as you will be listening to native speakers.