We also used to die (mostly) in our 60s. In the future, if the human race manages to extend their lifespan to ~200, then people probably won't be considered 'a

We also used to die (mostly) in our 60s. In the future, if the human race manages to extend their lifespan to ~200, then people probably won't be considered 'adults' until their 40s. It's all relative.