I'm glad that you feel good - but you may be suffering symptoms and not realize it. All of the symptoms of a slow thyroid are generally accepted adjectives to describe women as they age. They include:

Fatigue
Moodiness
Depression
Dry Hair
Dry Skin
Constipation
Irregular or Painful Periods
Swelling
Hair Loss
Difficulty Losing Weight [despite active efforts, even]
Decreased Sex Drive
Low Body Temps
Lethargy

If you have a family history of thyroid disorder, have ever been pregnant, have been previously diagnosed, or have had problems with your goiter or your thyroid gland in the past, then you are at a higher risk for developing this disorder.

I would seriously consider, especially if you have any combination of the above symptoms, following up on this!!

Good luck,
Margaret