the slowest of the slow

this old lady is the slowest receptionist in the world I can call her old lady, because she is probably my age so it cannot be discrimination, right? she must be somebody’s great aunt or a cousin of a sister’s friend’s grandma there is no other reasonable explanation. she is slow to answer the phone slow to take your money wants to waste other people’s time speaking to you when you want to go and they are waiting. the slowest of the slow