In this day and age, it is not at all unlikely to live past 100 years. The oldest person in the world lived to 122 years! We can all expect to be centenarians one day, and possibly even supercentenarians.
Many scientists view aging as a disease, one that doesn't need to happen. As they come to understand the cumulative effects of the genes that cause our cellular ageing, growing old may one day not be necessary. Unfortunately, until then, we are all faced with the slow senescence of our cells and bodies – the gradual accumulation of changes that draw us finally toward death.