I too am 32 years old and have the same problem. I have found they seem to multiply when I jerk them out. Like you said they are a different wiry texture from the rest of my hair. I just thought I was getting old..... I like the idea of the meds causing it better! Sad thing is this is where my mom's hair is white too.
What meds are you on? I'm on Pentasa, 6MP, Aciphex, Ostivia.