Nope, I'm younger than 24 The number 24 is actually part of some joke in a cartoon.. And yes, I think frame matters too because the same weight on two people that is the same height can have a big difference depending on their frame. However, I still haven't gotten to checking. I think I'm small to medium build and last time I checked (more than 1.5 years ago) I was 5'2 but I think I'd grown taller a bit since then.

Do you measure your inches? Maybe once every week or two would be good. Since you're also building muscle and losing fat I think you should check, so that while you might not be losing pounds you can still check your progress.