21,xxx miles is nothing. I say that's pretty light for a 2 year old car now. So long as it's the right price, the mileage is hardly ever too high, in my opinion.
2009 E90 M3
| Jerez Black | Extended Silver Novillo with Brushed Aluminum | 6MT | EDC | Premium Package II | Convenience Package | Enhanced Premium Sound | HD Radio | Heated front seats | Fold down rear seats | Moonroof | 19" wheels |