Is it normal for my hair growth to slow or stall at my age?

I am turning 30 next month. I just as of this year got my very first real girlfriend (whom I am now engaged to). Meanwhile, I am discovering I am developing health problems. I frequently have aching testicles. My doctor stated I was very low on testosterone. I was receiving testosterone injections at one point. In addition, I have severe sleep apnea and undergoing treatment for that.

Now, I am starting to notice much slower hair growth. I used to have to get a haircut every two weeks because my hair grew like weeds. I looked at my service history, and I noticed my last haircut was a month ago! My hair is still rather short since it was cut.

I am concerned about my fertility. My libido has also significantly dropped.

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Is it normal for my hair growth to slow or stall at my age?
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