National Silver Alert Act

National Silver Alert Act - Directs the Attorney General to: (1) establish a national Silver Alert communications network within the Department of Justice (DOJ) to assist regional and local search efforts for missing seniors; (2) assign a DOJ officer to serve as the Silver Alert Coordinator to coordinate the network with states; and (3) award grants to states for support of Silver Alert plans and the network. Defines "missing senior" as any individual who is reported as missing to or by a law enforcement agency and who meets state requirements for designation as a missing senior.

Directs the Coordinator to: (1) establish minimum standards for the issuance and dissemination of alerts issued through the network; and (2) make available to states, local governments, law enforcement agencies, and other concerned entities network training and information.

Authorizes the Attorney General to award grants to states and local governments to provide voluntary electronic monitoring services to elderly individuals (Sammy Kirk Voluntary Electronic Monitoring Program).

Kristen's Act Reauthorization of 2008 - Directs the Attorney General to make competitive grants to public agencies and/or nonprofit private organizations to: (1) maintain a national resource center and database for tracking missing adults; and (2) provide assistance and to law enforcement agencies, families, and victim advocates in locating and recovering missing adults.