TSH doesn't show a whole picture, and according to the endos I was working with, shouldn't be used to verify thyroid. It should include T3, T4, and free T3.
Yeah, your numbers are low, so it could be an issue. I don't know a lot about Clomid other than I didn't consider it when it was brought to my attention as a possible option. I didn't like the mixed results and the vision problems the endo mentioned. To me, it wasn't worth it. As far as should you even consider it being in "normal" range? Hell yes. That is not normal for a 3 year old and that range they determine normal in takes all guys into factor. Fat, 90 years old, poor diet, no fitness, etc- and you are at the low range of these people.
I am 38 and at my best around 800-900.