How can you in your youth (17-23 years old) take care of your future health in the middle years and in old age?

First, you need to get rid of bad habits such as smoking, alcohol, etc. Start going in for sports, more often get diagnosed by doctors, read information on a healthy lifestyle https://fitexpert.biz

You need to start training your body in order to increase its endurance. This is achieved through systematic training such as running 3 km. 2-3 times a week.