Growing taller

I'm not very tall but I never knew my height was a concern until last night.

Sara: How old are you today, mummy? (with a frown on her face)
Me: I'm 37 today.
Sara: Hmmm (another frown), I guess that's OK. (pats my hand) It's really OK mummy, you still have time to grow taller.
Me: Grow taller? Really? When do you stop growing taller, sweetie?
Sara: When you get to 100 years old, that's when you stop growing taller.

The wisdom is just too overwhelming for me.