Don't mistake "older" for more "mature."

It's a vague description of what they were doing meaning "in some way, or to some degree they were climbing the rocks."

Well, if I use the phrase "rock climbing" it has a relatively specific meaning in common use.

"Rock climbing is an activity in which participants climb up, down or across natural rock formations or artificial rock walls."

For instance "rock climbing" usually refers to "rocks" that are large in size and tall in height---rock formations that are … Read more