Final answer:
Craters in the lunar highlands are older than those in the mare Basalt, as they indicate a longer exposure to impact events. The highlands are significantly older due to a lack of volcanic resurfacing that characterizes the younger lunar maria. Although not 10 times older, the highlands are indeed much older.
Step-by-step explanation:
Considering the lunar highlands and the mare Basalt, the question of whether craters are usually older is tied to the geological history of the Moon. Craters on the Moon serve as indicators of age, because a surface with a higher crater density is generally older. This is because it has been exposed to space longer and thus has had more time to collect impacts from meteoroids and comets. The highlands are indeed covered with significantly more craters compared to the mare Basalt. Since the mare Basalt, or lunar maria, are the result of ancient volcanic activity that covered older craters and re-surfaced the Moon, they are indeed younger than the heavily cratered highlands. The highlands are composed of rocks more than 4 billion years old, while the maria were formed from volcanic activity approximately 3.3 to 3.8 billion years ago.
So, craters in the highlands are indeed not just more numerous but also older than those found in the maria, and their greater number does not directly translate to the highlands being 10 times older but does indicate a significantly older landscape due to the lack of resurfacing events that would remove or cover preexisting craters.