At what age do you think young people are old enough to make their own decisions without adult supervision? Explain. Please give an actual answer

Does anyone know the answers to these two? i don’t want to have to guess, you!

Based on your knowledge of word parts what does the word intervene mean

What is a generalization? a. a series of events that make up what happens in a story b. hints or clues that tell you what is going to happen in a story c. the final resolution or event that ties up loose ends in a story d. a simple statement about something complicated