What does having a tall stature mean?

Relative term. Most use the term tall stature when discussing the height of kids/adults in the top 10% of the population for their respective gender and age. Some limit the term to a narrower group in the top 5 or 3%. For example, a 6 foot 1 inch male adult would be included if the top 10% were uses but would need to be 6'2" to be in the top 5% or 6'3" to be a top 3%.