Yes Vitamin E does grow eyebrows and helps keep the eyebrows thicker.
I have applied Vitamin E oil to my eyebrows and I have noticed an increase in growth rate of the eyebrows and also the eyebrows got thicker when applying vitamin E oil.
Vitamin E oil contains the necessary nutrients for growing eyebrows and keeping them thick.
Yes some peoples eyebrows do thin with age.
Usually after age 40 most peoples eyebrows will thin out and get thinner and thinner and some people will actually lose their eyebrows completely when they get to 70 and above.
It's all normal and nothing is wrong with you if it does happen.
My Grandma started losing her eyebrows completely when she turned 70 and the doctor told her it was normal that some people lose their eyebrows completely while some people still have their eyebrows.
It's all normal.
The thinning of the eyebrows is caused by hormonal changes as you age.
Taking vitamin supplements and hormone supplements can sometimes thicken your eyebrows and may prevent the loss of eyebrows but there's no guarantee.