I think the best way to prepare for the coming century would be to train hard. Study agriculture, soil science, horticulture. Regularly train to build strength

I think the best way to prepare for the coming century would be to train hard. Study agriculture, soil science, horticulture. Regularly train to build strength and endurance. Maybe learn how to fight. Feel free to work on your 401k as well, but I think a better metric of your security is "How far can you carry 60 pounds of supplies and equipment in a day?"