What does it mean that the stomach ages first?

The incidence and mortality of gastrointestinal cancer remain high, but the early diagnosis rate is far below the world average. The sick people are younger, but their stomachs are aging. Olympus recently launched the "Love Stomach Month" charity activity with the theme "I want to act when my stomach is young". At the same time, the China 12 Urban Gastrointestinal Age Insight (referred to as "Gastrointestinal Age Insight") shows that people aged 35-55 have a weak awareness of gastrointestinal health, and the phenomenon of "stomach" (non-) aging is common.