Mark mentions a passenger, he is talking about whether you want to just go along with what everyone else is doing and not participating in activities. When he mentions the driver he means do you want to take action and go your own way. His warning about ” as soon as I ” is telling us to go do something you want to do, or do something before its too late. Holding something off doesn’t make it any better. Keri asked ” where did the last 20 years go? ” She was talking about making the best of your life, don’t waste it. When you are older you will regret not doing some of the things you wish you have done when you were younger.