Seems like a necessary thing to make room for more life. Plus, all living creatures here have biologies that break down over time. Imagine what state we'd be in if we lived to 300? We'd be falling apart!
I'm not sure it has meaning though. It's just something that happens because we are effectively all clocks winding down to the point where our mechanisms start to fail.
In some ways, it's pretty cruel to mess about with that mechanism. What's the point in extending life if that life is lived in discomfort and pain? Of course, if people still have their health and a good quality of life then great- good luck to them. We should get the choice though.
I wonder what age we are all supposed to die naturally- without medical intervention.