The phrase "live long" is often associated with longevity and a wish for good health. There are several alternative phrases that could convey a similar message. For example, "be healthy," "thrive," "prosper," "flourish," and "survive" all have positive connotations of a long and fulfilling life. Another option is to focus on the idea of longevity itself, using phrases like "longevity," "extended lifespan," "ages," or "years of life." Additionally, some cultures have traditional phrases or blessings used to wish someone a long life, such as "May you live to be 100" or "May you have a hundred children." Ultimately, there are many ways to express the hope for a long and healthy life, each with its own nuances and cultural associations.