How Fast Does Hair Grow?

I told my barber that my hair seem to be growing faster than it use to. He said that this was my imagination that everybody's hair grows at the same rate of a half inch a month from the day they are born until they die. He was so authoritative about it that I thought I would just fact check him. Here is what I found on the internet at this link "https://www.today.com/style/how-make-your-hair-grow-faster-t131559". 

It’s hard to say exactly how fast your hair grows — everyone is different! — but on average, hair grows about half an inch over the course of a month. That being said, it’s not unusual for hair to grow as little as a centimeter or as much as an inch in a month.

A number of factors can influence hair growth, some of which you can control and others you can’t. “The speed at which hair grows is determined by genetics but there are other factors that can affect the growth rate. Age, diet, stress, hormonal fluctuations, scalp health, hair care practices, medications and other health conditions can potentially influence hair growth,” said master hair colorist, Stephanie Brown.In general, men’s hair grows faster than women’s, but pregnancy can actually speed up the hair-growth process. Even the time of year can affect how fast or slow hair grows.“Hair tends to grow a little faster in summer and slower in winter,” said Dr. Alan Parks, board-certified dermatologist and founder of DermWarehouse. “An underactive thyroid can also slow down hair growth.”

Needless to say my barber has been "outed" bigtime.