B.C.
When my son was born I had a co-worker who's kids were pre school age. She told me
'You spend the first 2 years teaching them to walk and talk, and the next 16 years telling them to sit down and shut up.'.
Being a brand new mother I was very slightly offended, but then a few years passed and suddenly I knew exactly what she meant!
It takes awhile for them to learn to get to the point.
And then another decade goes by and as teens their answers start getting so brief it's hard to get a whole sentence sometimes.