1. Present simple tense: Used throughout the answer (e.g., "Children and teenagers are...", "they don't really see...") to talk about general truths and habits, which is appropriate for this type of question.
2. Modal verbs: "might not be as careful" and "would be" show possibility and comparison, adding nuance to the explanation.
3. Present continuous as a state: "They're still developing a sense of responsibility" uses the present continuous to describe an ongoing process, which adds depth to the answer.
4. Comparative structure: "as careful about keeping track of them as adults would be" uses a comparative structure to highlight the difference between children/teenagers and adults.