Is a Hair Transplant ok at Age 23? (Finasteride 1.5 years, PRP ~2 years, Minoxidil 3 years, LLT 2.5 years, DHT blocking shampoo

There is no right age to have surgery if you have a good understanding of what is possible and what to expect.
PRP or medications will not regrow your hairline or stop hair loss completely.
Hair transplant surgery cannot replace all the hairs you lost (and losing) but it can give you a better hairline and fullness.  
You should consult with a doctor for recommendations. 

The answer to your question is yes. It is possible to benefit from hair transplantation at age 23. However, of course, this requires a specialized approach using effective long-term planning to account for the likelihood of future hair loss. If your hair loss evolves to Norwood 6-7, it would be extremely important to plan for the long-term use of body hair. The amount of hair left on your head at  these severe stages of hair loss would not be enough to provide for your long-term coverage needs, eventually leaving you with an irreconcilable area of hair loss. This problem can be avoided by having a safe and effective means for harvesting body hair as an expanded resource to draw upon. At my practice, the Dr.U Hair and Skin Clinics in Los Angeles, we are able to help young men, like yourself qualify for hair transplant procedures,  rather than having them wait until they are much older.

In general, we assume that age over 25 is optimal to consider the hair transplantation. However, upon my expereinece, I had done a few cases of younger age patients who are really suffer from advance hair loss.
I have seen 18 year old with class 5-6 NH pattern , failed with all kinds of medical treatments and cannot continue his life because of low self esteem.
The important point is the surgery should be conservation if you do it early in life. You should start from small amount of graft and keep the hairline as high as possible. The medical treatment alongside with surgery is somewhat neccessary.