You are considering the purchase of several bonds and are concerned about the sensitivity of the bonds in what you believe will be a volatile marketplace for several years.

1. If two bonds being considered each have a coupon of 9% but one matures in 25 years and one in 15 years, which will be more sensitive to changes in interest rates?
2. If two bonds being considered each have a maturity of 30 years but one has a coupon of 9% while the other has a coupon of 6.5%, which will be more sensitive to changes in interest rates?