Why has living forever not always been fun for the tucks in tuck everlasting?

In "Tuck Everlasting," the Tuck family experiences the burden of immortality, which isolates them from the natural cycle of life and death. While they initially enjoy the freedom from aging, they soon realize the emotional toll it takes, such as watching loved ones grow old and die, which leaves them feeling detached and lonely. Additionally, their secretive lifestyle and the fear of being discovered create a sense of perpetual anxiety. Ultimately, their eternal life becomes a curse rather than a blessing, overshadowing the joy of living.