I have no doubt this affects young men. Erectile dysfunction in younger men isn’t based on something physical, it’s mental. And what mentally is likely to be affecting them? Insecurity is the most obvious cause. These guys are worrying they are “too small” or not making their girlfriend scream or orgasm enough like they’ve seen in porn.
Sure I don’t have data to prove this, but from actually speaking to people and reading so many posts from young man saying what I literally mentioned above, I’m strongly inclined to the above theory.
While 18 year old men can have physical issues which could cause ED, IN GENERAL, 18 year old men are in the prime of their life and also are usually extremely horny. I remember one kid I knew in school telling me he would jerk off 3 to 5 times per day! Not many 60 year olds are doing that...
The point is this, generally at 18-25 roughly your body is working better than it ever will, so I would be inclined to believe that if young men cannot get hard, on balance and probability, it's more likely to be mental than physical.
If it was physical, then why don't we see the same trend in older men?