I am only 24 so, do not plan on doing this.
Yes, I realize it is for life but, I figure if your test will begin to naturally drop off and you plan on weightlifting and staying "optimal" for as long as you can that TRT will have to be done. Why not start when it begins to fall? Can you not take precautions to stay fertile.
Starting before you have low T and symptoms is not TRT but, neither is taking the 150- 250 mg a week many do.