I am 35 year old. And yes I am done having kids.
If you did not use prohormones or AAS before, then it seems like you have naturally low testosterone levels, which might make you eligible for TRT. Besides, the age is fine already for going into TRT. Do you feel any of the symptoms of low T? Such as low libido, difficulty gaining muscle mass, fat gains, low energy, bad mood, etc?
The thing is that the T level is mostly just a part of the story, since many guys with low T will have no problems, whilst other guys with normal T levels will on the contrary feel like they got it down.
Anyhow, given your age, you should pay a visit to a doctor, who based on your blood work should prescribe you with TRT. In such case you would have a legal excuse to be using test.
Then, it would be test to be on TRT for a month or two, and see how you react to the compound. If everything will be fine, then you can just do a blast during the TRT. In fact, this way you will be saving yourself the trouble of having to run the PCT, since no PCT is needed when you blast on TRT.