"If you are a reasonably risk-aware teenager today in an affluent, non-violent neighbourhood, you have a risk of dying in the next year of well under one in 1,000, which means that if you stayed that way forever you would have a 50/50 chance of living to over 1,000."

I know there is a shortcut to this but for this to be true you need a constant rate of 1 death in 1415.78389 per year.

1 / (1 - 10 ^ ((log .5) / 981)) = 1415.78389 so (1-1/1415.78389) ^ (1000-19) = .5