What significant event in Twilly's life occurred at the age of 18?

In Twilly's life, the significant event that occurred at the age of 18 was the death of his grandfather. This moment is often impactful for individuals, as it can signify the loss of a family member who may have played an important role in their upbringing or personal development. The death of a grandparent can lead to profound emotional experiences and may influence one's outlook on life and future decisions. While other options may represent milestones like graduation or independence, the emotional weight and potential shifts in personal identity or family dynamics that come with losing a loved one typically have a lasting effect on a young adult's life.