What are typical vocabulary growth rates (say, in words / day) for children and adults in their native languages? Has there been enough research to plot vocabulary growth rate vs age?
I'm especially interested in how many new words adults learn per year, on average, simply due to new words entering the language.
I'd guess adults probably still learn words at a surprising rate due to the evolving language, but also that kids still beat them out of the water. But it would be nice to quantify this.