I'm not sure specifically who 'Gregory Green' is in this story without more context. It could be an ordinary person with his own unique experiences, or perhaps a character created for a particular fictional narrative.
The 91 - year - old gymnast's story is probably one of perseverance and passion for the sport. Maybe this person started gymnastics at a young age and has continued to practice and love it throughout their long life. It could be that they inspire others with their physical ability and determination at such an advanced age.
They are often based on historical events and figures, but some fictional elements are added for dramatic effect. So, they have a mix of truth and creativity.
Not really. Hope is usually a fictional creation that may draw inspiration from various elements but not directly based on a specific true event or person.