I'm in a similar boat...took a class (one class) at a CC back in 1997 and got a D. Re-took the same class (different CC) as I started my "real" college journey in 2006 and A'ced it. Now at 4-year state school and don't even have a C, and I never transferred the D from '97. By the time I apply to med-school, it will be close to 15 years since that D. But...I'm planning on going back to the original CC and seeing if they can somehow forgive it. I don't know - tough call - it they won't, I will probably just be honest about it. Would hate to be the statistical anomaly that keeps me from going to med school. Plus, I know I'd just worry about it all the time! 🙁 Good luck.