For adults aged 60 and older, this reduced risk topped out at around 6,000 to 8,000 steps a day. Pushing further might have other benefits, but a reduced chance of death isn't one.
The study found that those who are younger could do well to walk a little more, but there wasn't evidence that they'd necessarily live longer by walking more than 8,000 to 10,000 steps a day.
As for the rate of steps, the team found volume is what really matters.