Former first lady Barbara Bush is promoting literacy on her 90th birthday.

Her foundation and Dollar General are partnering with X Prize for a $7 million global competition to create an app to boost adult literacy skills.

Bush said Monday that parents' literacy level is a "significant predictor of their child's future educational success, influencing generations to follow."

The original X Prize was awarded 11 years ago for privately funded, suborbital flight. Since then, there have been other X Prize competitions aimed at spurring innovation.

Family members including former Florida Gov. Jeb Bush are in Kennebunkport for her birthday. A gala was planned for Monday evening with special guests Amy Grant, Reba McEntire and Michael W. Smith.