LAW REFORM AND HUMAN-REPRODUCTION - MCLEAN,SAM

Twin test-tube girls born to a 53-year-old grandmother are ''beautiful, absolutely fantastic'' and should inspire others who have difficulty having children, their father said today. ''I feel like a proud dad, very proud,'' Don Shearing, 32, said at a news conference at Martin Luther Hospital, where the girls were born prematurely on Tuesday . . . . Mrs. Shearing is believed to be the oldest American in the latter stages of menopause to deliver babies through the in-vitro process, said hospital spokesman Dennis Gaschen. The twins were conceived using sperm from her husband of seven years and eggs from an unidentified donor in her 20s .... Shearing said the couple decided to undergo in-vitro fertilization in part to set an example for other older women and couples with problems having children. Mrs. Shearing miscarried a non-test tube pregnancy four years ago. He dismissed criticism that his wife was too old to have children and noted that many older men become fathers.1