Picked up a cream puff 2013 Volkswagen Jetta with 23K miles on it that literally was a "Little Old Lady from Pasadena" type owned vehicle. Garage kept and dealer provable oil changes every 5K miles maintenance. As I do with all new to me used vehicle, I go through maintenance schedule and work on changing out any items that can not have been proven already addressed. Per the maintenance table, spark plugs are a every 40K miles interval but has a side note of "Every 6 years regardless of mileage: Replace spark plugs". Mileage wise, I am have another 17K miles to go. Age wise, I am pushing 7 years on the vehicle. I have never heard of changing spark plugs due to age. What are the risks of just blowing off the age requirement and running them out to the normal 40K miles before changing them?