This episode's headline: Taxing Issues; Working Teens; Abortion Politics; Alzheimer's Disease. ANCHOR: JIM LEHRER; GUESTS: DIANA FURCHTGOTT-ROTH, American Enterprise Institute; MAX SAWICKY, Economic Policy Institute; CAROL TOBIAS, National Right to Life; GLORIA FELDT, Planned Parenthood; DR. STEVEN DeKOSKY, University of Pittsburgh Medical Center; CORRESPONDENTS: FRED DE SAM LAZARO; BETTY ANN BOWSER; SUSAN DENTZER; RAY SUAREZ; SPENCER MICHELS; MARGARET WARNER; GWEN IFILL; TERENCE SMITH; ROGER ROSENBLATT; KWAME HOLMAN