When you combine the potential lack of punishment for juveniles with the biological reality that prefrontal cortex development in adult humans doesn't really complete until the mid twenties, you get teenagers who don't think bad outcomes are possible, and whose brain is less capable of long term risk assessment.
I would think that the 50+ crowd would be far more hampered by their risk assessment of the negative outcomes of these behaviors than by their skillsets alone.
A teen is in it for the lulz, or the glory, or whatever, but a greybeard could lose his retirement, leave his spouse high and dry, lose his ability to see and support his family...