Interesting statistics
I'm quite sure most adults would be well versed in the videogame world of this age. Some of the people in their 50's now were 20-30's when the amiga and nintendo and etc came out in the 70-80's, so it's more of a society boom during that time which may have lead them to play now, as progressed over the years.
The way I feel is that if you've never played a console or PC game your life from age 1 to 40-45 or something, chances are you aren't into games yourself, and are highly unlikely to get "into your game".
However, my personal opinion between the varying difference of gamers is that they should be split into tiers by how serious they play.
What I can think off the top of my head would be like:
Casual - ~10 hours a week, or a few hours every other day
Moderate - ~a few hours everyday
Aggressive - ~ 5 hours a day
Excessive (Serious) ~ 8+ hours a day
The serious generation of videogamers, read as hardcore gamers - these are most likely still at an all time minimum, a majority being multiplayer gamers. It's easy to point & discover them from MMORPGS, where generally the rewards you get are from the time you spent. Like having that level 80 WoW character with the best gears in that game, or a Final Fantasy 11 character with all jobs to 75, etc.
Some people do "game hopping", which is a term I coin, that isn't making it's way into mainstream yet. Game hopping refers to playing one game until you are tired of it, and jumping onto the next game. This can be broken down by hours, or from finishing one game to another.
But the way the gamer percentile (again, these are anecdotal figures that I personally cooked up from my opinion)
Casual - 70% of gamers
Moderate - 15% of gamers
Aggressive - 10% of gamers
Excessive - ~1-5% of gamers
My two cents I thought I'd share with everyone else.