[Whale when lives in the natural habitat sea, it lives 100+ years but when whale is confined to zoo, it hardly lives 15-20 years]
शतायु is a limit of long life. Limit that is generally achievable by mass. Yogis can live beyond 100.
100 – how?
प्राणापानाभ्यां गुपितः शतं हिमाः|
By regulating two vital forces-प्राण & अपान
Death before 100=प्राण & अपान compromised early in life by life-consuming forces.
Think about it. What are these life-consuming forces?
To give you top 5 hints
1) Stress
2) Stress
3) Stress
4) Stress
5) Stress
Stress of different kinds. Mental to cellular to environmental.