Thats going to happen if they are dumbasses with dosage after they are 25 regardless.
I first took gear at 22 after 3 years training, I have used on and off since then and am now almost 50, I have never had erection problems, sure my sex drive has gone up and down occasionally but as for getting it up , its never been an issue.
I have always been sensible with dosages and only once have gone over a gram a week, I also have rarely used PCT after a course, just come off and train through it.
I know that doesnt seem to be the current methodology but it worked for me.
The OP using 250mgs of test a week isnt going to cause him any problems at all.
I actually dieted and competed on 200mgs Deca a week for 10 weeks back in the day.(I only had 1 x 10 ml vial), I told a guy at the gym what I was using (superheavyweight Brit top 6 guy) he burst out laughing, he was using two vials a week amongst other things.