just wondering if younger brains are more susceptible to hppd or just whether younger people are more likely to take more drugs. I remember some years ago after a long drive i would close my eyes and images of the road would flash up. I just drove 9 hours at the weekend and still didnt get this again, suggesting my brain processes better. And the younger brain is more impressionable and hasnt set down its main pathways so strongly. Perhaps if i waited till now, aged 33, to take hallucinogens, i would not suffer hppd? So anyone out there get hppd after, say, 30 years old?