Isn't it a bit late for that to make a difference to the current problem? You're looking at a lead time of at least 15 years before any babies born now can have

Isn't it a bit late for that to make a difference to the current problem? You're looking at a lead time of at least 15 years before any babies born now can have a positive effect on the cared/caretaker ratio. (What is the english term for that anyway?)