Low Testosterone for My Age?

Yes.
What is your weight?
Medications?
Steroids?

Have Dr check

Lh
Fsh
A1c
Dhea s
Acth
Am cortisol
Metabolic panel
CBC
Lipid panel
Ferritin
Thyroid panel

You may need testicular ultrasound. And pituitary MRI. Get blood results first. You need to investigate for diseases. i.e. adrenal tumor / fatigue, pituitary tumor , testicle issues.

Ok to use Viagra while you figure this out.

You need to advocate for yourself with the Dr. Tell them you want to make sure nothing else is wrong that’s why you want tests.