Hair math: Shedding

It makes me think how little just 10 hairs more or less a day can make. Of course these calculations have some problems…
I don’t know exactly how many hairs I have on my head (I would honestly think it’s more than the 140.000 that blondes are said to have)
Some hairs have a longer growth cycle than others
Breakage and trims are not included

365 days with circa 40 lost hairs per day means 14.600 hairs per year
140.000 divided by 14.600 means it will take me circa 9,6 years to have replaced all the hairs on my head (terminal)
A years worth of growth is circa 18 cm / 7,5 inches
It means my hair will circa be able to grow 173 cm / 68 inches

365 days with circa 50 lost hairs per day means 18.250 hairs per year
140.000 divided by 18.250 means it will take me circa 7,6 years to have replaced all the hairs on my head (terminal)
A years worth of growth is circa 18 cm / 7,5 inches
It means my hair will circa be able to grow to 145 cm / 57 inches

365 days with circa 60 lost hairs per day means 21.900 hairs per year
140.000 divided by 21.900 means it will take me circa 6,4 years to have replaced all the hairs on my head (terminal)
A years worth of growth is circa 18 cm / 7,5 inches
It means my hair will circa be able to grow to 115 cm / 45 inches

Look at the difference just 10 or 20 hairs make!

On damp, leave in-conditioner free hair after a CO I measured
Distance from the neck in cm: Thickness in cm
0: 12 cm
15 (Shoulder): 11 cm
35 (BSL): 10 cm
50 (Waist): 8,5 cm
65 (Tailbone): 7 cm

My excel refused to work, so I had to draw in hand and my estimated terminal length comes to around 135 cm which is knee length on me