I downvoted because high-impact activities are known to build bone density. I honestly don't know what causes one person to get injured and not another, but I don't think it's the "impact" of running, which is what our bodies were made to do. High- (or medium?-)impact activity may very well be part of the mix of what keeps you strong into your golden years.
Resistance training is known to build bone density too.
Our bodies weren't "made to" run on concrete. Our (male) ancestors hunted by chasing animals on soft ground for a long time, sure. That's a lot lower impact than a lot of sports that injure people.
