Two hundred years ago, people usually lived to about 40 years old. But now, kids born after the year 2000 can expect to live to around 80. If there are no major problems in the next twenty years, like world wars, pandemics or big climate disasters, people's lifespans will likely increase even more. With the medical technology we have today, it is possible that by the 2040s, people can live to be 90 years old or even over 100. Elon Musk even believes that in the next twenty years, once we solve some big challenges with technology, like connecting our brains to computers using brain-computer interfaces and memory chips, we certainly can live much longer. At that time, people might not just live longer; they might even find ways to live in a digital form forever. All these changes could initiate a huge shift in how we live and start a new era for humanity.