Youth is a stage of mind rather than age. It is having the energy and mind set to do greater and newer things. So that the ideology about who a youth is not based on age but by deeds and mindset.
It is difficult to accept the fact that being energetic or not is associated with the youth. Those we describe as matured may also be energetic.
In terms of dynamism, today's man is explorative due to the advent of technology. Of course those up and coming people would to experiment and take certain risk than some elderly people. The simple explanation is that the elderly have been there. Dynamism is a quality of the today's man.
My view of ethics is simply "using your towel to clean your hands, other than of your room mate's using the washroom in the absence of your room mate."