They keep talking we are living in modern times. But we still grow old and die like animals. I hope scientist would soon discover how to control aging. I envision a future when humans never grow old that could live for many years as he like never fearing of going old and dying.
Can you imagine the horror of it? Never to die... scary if you ask me.
Look how today world looks like, millions suffering of hunger, lack of shelter and cold.
Redistribution of goods is far from perfect, everything based on medieval principles of supply and demand where times have changed, availability and ease of transport with it.
3-4 centuries old human beings would only add to the chaos. New cast of people would arise, world owners and along with it more violence and envy. Bad idea imo. I think humanity should focus on repairing damage done by millennia of extortion over 3rd world country's, spreading word of enlightenment etc.
More people equals less food, drugs, goods and health care, all we need is even more mouths to feed.
Medicine for all that? Space exploration and robots