Luca Nicola reacted to Minoo for a post in a topicHello Nicola, 1. We use 'young' for people who we consider are 'middle-aged' or 'old' now, and 'younger' for people we consider 'still young'. It's a subjective choice. 2. I agree with you that 'the' is not necessary before 'mobile phones'. Maybe there's a typing error in the exercise.
Minoo reacted to Bernard M for a post in a topicI am very happy that this was an opportunity for you to learn something after all you have taught me.