Too Little Moon Dust
Only a thin layer of dust covers the moon’s surface. However, this does not prove a young age for the moon. Before the Apollo lunar missions, a few scientists had predicted that a yards-thick layer of dust should have settled on the moon over billions of years.
Those predictions got a lot of press, yet further satellite measurements of dust in space indicated a much smaller rate of accumulation than previously assumed. This does not mean the moon is billions of years old; modern scientists cannot know the rate of dust accumulation in the past or the amount of dust originally on the moon. Therefore moon dust cannot be used as an age indicator one way or the other.