Huh?

Just a moment ago, while i was lying on the chair, where my head was on my mum's kawaii (round round) stomach, she played with my hair. Suddenly...

My mum :
" 1.. 2.. 3... 4 ...."
" 4 white hair!!!! Gai liao la!! Gonna take you to the doctor!! "

Me :
" ... "
" white hair only ma, need to see the doctor meh? "


I'm not sad or nervous, but but but...
What the hell?
I thought i'm just nineteen years old?