The good: My girlfriend is on her one of her dads cards that was opened in 1993 that has had a perfect payment history.
The bad: This card is being utilized highly - around 80-90%.
By getting her off the card, she loses almost 15 years of credit history, but her utilization goes down as well. She has a few other accounts opened in the past few years and she uses one regularly (good payment history).
Her score is in the low 700s so I'm leaning towards leaving it alone. Do you think getting her off this account would increase her credit score?