As much as I want to believe the premise, I have to admit that I am a bit skeptical of the idea that young people today are less masculine in terms of physical attributes. I don't really see that out there. I graduated high school in the mid-90s and just thinking back to that time, I don't recall us being any more masculine (physically) than the kids I see today working in the grocery store, retail, etc. Many of them are also much, much taller which is very intimidating in its own way. I think if you took my class from the mid-90s and put them up against a typical high school class today, we would get destroyed in every single sport you could think of. On the other hand, I think on average we were a lot less overweight.
That said, I do perceive that young men today have a much more effeminate mental frame, but that can easily be explained by the drastically more effeminate social construct compared to 30 years ago. The difference in the social construct is so vast and undeniably more effeminate and there's no way a young person can grow up in that without it affecting him.
Then you have the circumstance where older generations needed to be more physical in terms of play, manual labor, etc. when young and that also exposes boys to a more masculine frame.
All that said I don't think it's a bad idea at all for young people to try to optimize hormones but I doubt that we quite know yet what we're doing. The first time I got my testosterone checked (a few years ago, so in my 40s) it was near 1200 ng/dL but you would never think that by looking at me. Other than my jawline and my politics you wouldn't surmise that I had high testosterone. So I think there is something much more to it. Maybe it's something about androgen receptors and transcription. I don't know what the best formula is. I've tried raw DHT powder and androsterone and didn't really notice anything of interest. If anything it just made me even more GABAergic.