Here is a condensed list of 20 important lessons that can help a 50-year-old man live a healthy and happy life for at least 50 more years:

1. Prioritize sleep: Aim for 7-9 hours of quality sleep every night to support physical and mental health.
2. Follow a balanced diet: Emphasize whole foods, fruits, vegetables, whole grains, lean proteins, and healthy fats.
3. Stay physically active: Engage in regular exercise, including cardiovascular activities, strength training, and flexibility exercises.
4. Maintain a healthy weight: Achieve and maintain a healthy body weight to reduce the risk of chronic diseases.
5. Manage stress: Practice stress-reduction techniques such as meditation, yoga, or deep breathing exercises.
6. Foster strong relationships: Nurture and maintain meaningful relationships with family, friends, and loved ones.
7. Engage in hobbies: Pursue interests and hobbies that bring joy, relaxation, and personal fulfillment.
8. Prioritize mental health: Seek professional help if needed and practice good mental hygiene by engaging in activities that promote mental well-being.
9. Stay intellectually curious: Keep learning and challenging your mind to stay sharp and engaged.
10. Practice gratitude: Cultivate an attitude of gratitude and focus on the positive aspects of life.
11. Stay socially connected: Engage in social activities and maintain connections to your community.
12. Set realistic goals: Establish achievable goals and celebrate your accomplishments along the way.
13. Embrace aging: Accept and embrace the natural aging process, focusing on the wisdom and experience that come with age.
14. Stay proactive about health: Regularly visit healthcare professionals for checkups and screenings.
15. Limit alcohol and avoid smoking: Consume alcohol in moderation or not at all, and avoid smoking or using tobacco products.
16. Cultivate resilience: Develop the ability to bounce back from life's challenges and hardships.
17. Practice mindfulness: Cultivate present-moment awareness through mindfulness practices such as meditation or deep breathing.
18. Create a positive living environment: Surround yourself with a clean, organized, and uplifting living space.
19. Give back to others: Engage in acts of kindness and volunteer work to help others and create a sense of purpose.
20. Establish a work-life balance: Strive for a balance between work, personal life, and leisure activities.

By following these lessons and prioritizing physical, mental, and emotional well-being, a 50-year-old man can increase his chances of living a healthy, happy, and fulfilling life for many years to come.