Cancer is more of this. See, cancer is the side effect of living a long life. As long as we live, we shed our cells and they divide to replenish the numbers. Human cells can only divide so much before they get too short to be divided successfully, this is when the mutations take place.
Thanks for reading and writing a response. You are absolutely right, instead of spending time worrying about the future, it’s best to put the energy into doing and figuring out through trial and error. If you can’t find what you want to do, it’s always good to find out what you don’t want to do.