Death
(This is based on the numbers from the US)
Dying of old age is one of the best ways to die. Sadly, around 30% of all deaths are unnatural. Thus, your odds of not dying due to old age might be much higher than you expected. In case you're already over the age of 55, the rate drops to around 5%.
To counter balance this, if you're under the age of 55, your unnatural death probability is significantly higher.