Mujo: Impermanent Concept

To begin with, please read through the attached PPT. You can find it just under the photo of Angkor Wat in Cambodia.
It is not easy to think about the meaning of impermanence, particularly for young people like you. As explained in my PPT, understanding impermanence is one of the essential teachings in Buddhism. The questions are; What kind of things or people do you feel mujo (impermanence), and what kind of objects, things, or actions do you think are permanent (immortal)?
If the impermanent concept is too vague, please consider when you feel sadness and why (what makes you sad?) On the other hand, when do you think your mind is peaceful and stable, considering something or someone everlasting?
As I get older, I feel time passes faster and faster. The speed of time passing that I perceive must be different from yours. When I wake up early, such as at 4:00 a.m., I am overwhelmed by fearful thoughts, "How long is my remaining time in my life?" The outside is dark, and I cannot fall asleep when I wake at such a time. When the outside becomes brighter, and birds begin to sing, I feel at ease and do not feel intense fear.