For what it is worth - I am in my 30s, but not really having a healthy lifestyle. Had test of about 250 (one of the labs I done in search of getting motivation back). Doc put me on trt. In 4 month we dialed it to about 900-1000 stable. Had no noticable improvements in any areas (except morning wood like I am teenager again). Later there were some side effects and I discontinued it. Again, no noticable differences.
For what it is worth, it appears that my body seems to need just that much of test.
Some people have more receptors and/or are more sensitive to certain things.
Higher testosterone leads to more risk taking and other adverse behaviors, as well as increased blood pressure and, anecdotally, "increased aging." I believe it has something to do with collagen synthesis.
You absolutely made the right decision to come off TRT.
For what it is worth, it appears that my body seems to need just that much of test.