Retirement is the buzzword around the Statehouse in Trenton. Eleven of New Jersey's forty state senators will not seek reelection this fall, and two more Democrats may not be re-nominated. Those senators leaving voluntarily cite age, 68 on average, the rigors of campaigning and fund raising, the decline in civility in the legislature and, for the minority Republicans, the inability to accomplish anything as reasons for retiring. All the seats being vacated are considered