In fairness, infant mortality likely kept life-expectancy figures low for prehistoric man.
But among those who made it into adulthood, even the most mundane problems associated with lack of medical care – i.e. rotting teeth, hemorrhoids, sinus infections, etc. – probably made them wish they were dead.
And, as far as I knew, deaths due to injuries incurred during mastodon hunts are way down over the past few millennia.