As we age, there's a tendency for our thyroid to slow down and produce less thyroxine. A little slow is not a bad thing as long as you don't have any dramatic symptoms. In fact, when they tested centenarians, they found that most of them had this in common.
If you eat a calorie restricted diet (i.e., healthful low calorie whole foods) to slow down the aging process, your thyroid will likely get slower too and produce less thyroxine and that in turn will slow your metabolism. That's why it can be good.
Go by how you feel. If your thyroid is a little slow (hypothyroid) but you feel well, I would leave it alone. Ask your doctor about this and get a second opinion if necessary.
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