This post is one of several on business heirs apparent. Let us know in the comments whether you think Roger Penske, Jr., should take up the reigns of Penske, and be sure to check out the other heir apparent posts.

Roger Penske is as much a fixture of the auto racing world as any person could claim to be. At 70 years old, he's still an effective if not brilliant leader, with his hands on the wheel of a carefully built, racing world success. You have to wonder though, if Roger Penske is getting ready to step aside and let some new talent slip into the driver's seat. If a change in leadership fits into his immediate or mid-range plans, who might his replacement be?

With four sons and one daughter, Roger has no shortage of Penske offspring who might be considered for stepping into the racing patriarch's formidable shoes. The question is, are any of them fit for the job? We may have gotten just a glimmer of what's to be expected by the recent stepping down of Roger Penske, Jr., from his position as president of Penske Automotive Group Inc. (NYSE: PAG). Roger, Jr., is reported by Crain's Detroit Business to be retiring from Penske Automotive and purchasing four California auto dealerships from Penske Corp. Is this change to facilitate his being groomed to step into his dad's position? No source I've seen appears to be sure if that is the case.