Ikigai is about finding our life purpose and living longer, according to wisdom from Japan where people do live longer than average. The key ideas include: doing activities that make us feel 'flow', nurturing enjoyable relationships, keeping busy after retirement, and daily light eating and exercise.
Lifespan is about how to live longer and healthier, according to the latest science. Harvard researcher David Sinclair says that aging is a disease that will be treatable and—perhaps one day—completely preventable. For now, we can boost our longevity with practices like fasting, exercise and cold exposure.