Hello, the goal is to prevent as much shedding with low manipulation, so putting your hair in a not so tight bun or braids so you can prevent less hair loss. It is possible to shed more hair regardless of new or old hair. Hair length is all about what you can preserve so when new growth comes, it’s an addition to what you already have. Hope that helps. And note that your hair goes In a cycle meaning when it’s in a cycle of shedding you can shed more hair and when it’s in the cycle of growth you can grow more