I had one damaged testicle. Puberty was induced at age 15 when I had undescended testicles and no natural puberty. They dropped, but I found out in my late 20s that my motile sperm count was half normal. I never had testosterone measured until just before HRT, where I got a reading of 650 (normal).
Starting at age 62, after 5 years on finasteride, a weak anti-androgen for prostate enlargement treatment, I've been on a low starter dose. Despite that, I've gone from moobs to a Tanner Stage 2, and quickly heading for 3 on one side (typical... The other side will catch up.). I'm about a 36A on top this week. That's about 6 weeks of Estrodiol and 10 weeks on spiro.
This bodes well for the future. I was surprised at this for my age, but it isn't uncommon. You might get a very good result!
Oh, I'm a Kaiser Northern California patient. They've been excellent for me.