I've been 125 at 5'9", that was my weight after I recovered from disordered eating and until my husband asked me to bulk, so from 20 years old to about 48. Nobody really commented that I was too thin (except husband), I looked slender not skinny skinny, was in shape, worked out. More cardio less weights.

90 lb when having trouble from 16 to 20 - that looked skinny and surely wasn't healthy but I still got my period.

150 now since gaining - aimed for 145, overshot. Still aiming for 145 finally making progress, slowly. People STILL think I am thin. I am not. This is more than I weighed 9 months pregnant and honestly it freaks me out a little. Doctor says it's a healthy weight still though.

ETA - 125 at 5'9" is barely even underweight by BMI. 128 lands in Normal territory.

Yeah I've been 5'3" and 115lbs. I was really unhealthy, underfed, and thin.

It's bonkers that there is so much support in here for people saying shit like Taylor Swift isn't skinny.

I think it's a cultural thing, some places people just have lower BMI's genetically or dietarily (is that a word?).

I'm considered skinny at 6'4 130lbs, but all of my friends who are all a little underweight or "barely healthy" according to BMI wouldn't, they'd just be considered thin, since the median weight is much lower than in, say, the US.