It is undoubtedly a very interesting and at the same time complicated subject. As you mentioned, the ideal would be to increase people's lifespan but also to allow them to remain active and contribute to society, free of diseases.

One factor to take into account is the overpopulation that is already being observed in the world. What measures would be taken to avoid overpopulation.

This goes beyond just extending people's lives. Several things would have to be changed in the world and society to do this successfully.

Best regards!