My derm says it's normal as you get older, and that I'm imagining it, but my hair is definitly getting thinner. Both as a thick head of hair and also the diameter of each strand has become smaller, so my hair feels softer and finer than it used to. (I had almost asian looking hair as a teenager).

I also noticed my hairline has moved a bit up because I have a very tiny scar on my forehead which my hairline has moved further from.

So...is this normal as you get older?

absolutely. it can also change color as you get older. although that's more noticeable on lighter colors like blondes and redheads.