, in section "Is there a change in the preventive influence of ADHD medication on accident/injury risk over the lifespan in ADHD patients?"

ADHD medication thereby reduced the risk of transport accidents by about 58 % in both young and middle-aged males but did not reduce the risk for females in any age group (

Surprisingly, we still don't have good evidence about this.  There's some disagreement about how long stimulant medication works, or if your body just gets used to it.  Ideally we'd get a long-term RTC, or similarly-strong evidence.

Whenever such strong evidence is available, will it be found that long-term stimulant medication of ADHD lowers the accident hazard ratio by at least 1.2x, in men, even after 2 years of continued treatment?

Resolves whenever strong causal evidence is finally available, to my satisfaction.  By the way I haven't fully read the papers, in fact, you could say the subject matter pertains to me.