health value

after getting old little by little, we found that health is so important that it means everything for life. many people pass away before 60, while others living until 90 or even 100. that means they have double life or even third life. according to the formula of accumulation. our knowledge & wisdom can upgrade very rapidly after long period of intersection.
the time & energy we invest into health just like the money & technique we involve into business.  money can rebirth another money because interest growing up. while health improve by clean the precipitation of vein & artery, and strong the function of muscle and heart & lung.
After 50 or 60, it time to withdraw the investment of health. when our eyesight are clear enough to read or appreciate environment. our listening comprehension is good enough to music & nature voice. and our body is strong enough to walk & hiking, and even travel for a long distance without any difficulty. so we really enjoy our second life after hard working . 
If we can only stay in house & doing nothing, watching aside for youth to enjoy life yet only watch. that means we waste our life already.