New population projections suggest that in 30 years, 1 of 4 Rhode Island residents will be 65 or older. The forecasts released Thursday say the state will see little overall population change until projected growth in the 2020s, when the number of jobs in the state is expected to surpass prerecession levels. By the 2030s, the rate of increase is expected to slow as the state’s population continues to age. Residents 65 and older now make up 14 percent of Rhode Island’s population. They are expected to constitute 25 percent of the population by 2040. The figures show that more people are leaving Rhode Island than moving in, while the projections reflect aging baby boomers and a falling birthrate.