That was a most enjoyable read. You've got your characters down pat. The conflict is established from the start. We have vanity and the price of vanity. Some interesting details that entertained this reader: The Long March, harking back to Mao's Long March. Colleagues Yuri and Shihong, names that reflect perhaps a future development in the geopolitics of our time. The science fiction aspect of the piece holds together nicely--one aging twin, one that remains young.

All the pieces in the story fit together seamlessly. The resolution is as satisfying for the reader as it is for the protagonist.

Thank you for sharing this engaging, science fiction story with us, @stuartcturnbull.