it depends on your definition of "adults".
many consider themselves to be adults at the age of 14.

Also I think the Wii targets adults, as in mature 30+ y/o people. The market there isnt huge (even for the Wii) but the Wii is the first console I know of to actually aggressively market for that demographic.

First, the generation's aren't really getting "bigger and bigger." For example, the Playstation 2 was approximately as strong as the Playstation 1 when you account for population increases (the population increased by about 5 percent during that time frame, so the PS2 sold a tad more, but not much). There are two generations where we have, thus far, seen a major jump in size: the NES and PS1 generations, respectively. In short, we haven't made much headway into the adult market in 12 years, since the PS1 was released.

You seriously overestimate the Playstation's appeal to adults. This was shown quite clearly in a recent poll:

http://biz.gamedaily.com/industry/feature/?id=16691

The relevant quotation:

Interestingly, the Heavy Gamer segment is a lot younger than one might think too. "What always seems to surprise people, especially those that talk about the 18-34 year-old 'core gamer,' is that a majority of the heavy gamer segment is kids ages 6-17! This is true also for the 'Avid Console' gamer segment. Alternatively, the Avid PC gamer segment is older, with just over 40% represented by 18-34 year-olds," Anita Frazier, NPD industry analyst explained.

The average "hardcore" and "console" gamers are 6-17! It's the PC Gamer crowd that has upped the age, as this clearly shows. What games on the PC are adults playing? Based on press, the clearest games are "The Sims," "Bejeweled," and "Civilization," all of which have boasted about their older -- and more feminine -- audiences. Please note that these games are lacking in violence almost completely.

http://www.actiontrip.com/rei/comments_news.phtml?id=070507_8

As this survey shows, children are actually the ones most interested in violent games. Violence is, I suspect, I direct impediment to mass adult adoption of video games.

Less importantly, I work at a Toys R Us, and can absolutely garauntee you that I sell many more Wiis to adults than I do PS3s to adults (I ask who the purchasers are buying it for, so that I can sell them warranties. I have only a handful of adults tell me they are buying PS3's for themselves, while I've had dozens of adults say that about the Wii). Keep in mind that I mean adult adult -- I sell a goodly number of PS3s to 24 year old males, for example, just not many to 36 year old ones, and literally zero to women.

Now -- most importantly, simply watch the first portion of this:

http://www.ign.com/index/e3/2007/videos/

Nintendo's penetration in to the adult market has literally doubled in two years. Doubling your penetration of any demographic in that short a span is unprecedented. There is no better evidence that Nintendo is leading the charge into the 25+ demographic right now (although clearly, they were not leading the charge before then, as you suspected). 

http://www.destructoid.com/get-your-poor-grandmother-out-of-that-home-and-into-a-wii-bowling-league-30687.phtml

You can also find a ton of stories like this one, if you're looking for more small evidences.

The anecdotal evidence -- and more importantly, the statistical evidence -- all suggests that console gaming was effectively stuck as a young male market, and that the DS and Wii are very rapidly pushing past that. The Playstation 1 was very important in expanding the market from 6-14 year olds (where the SNES was, effectively) to 14-25 year olds, which is where we have been stuck: but gaming has made very little headway beyond that 25 year old age bracket since then, as the similarity in sales between the PS1 and PS2 shows (the PS1 sold almost twice as many systems as any system in history had done before then. That is market expansion. The PS2's 5-10 percent increase over the original PS1 is not market expansion). This is the first time we've seen real, substantial evidence that video games are moving considerably beyond the 30 year old age limit.

Those are honestly some very funny answers by Jack.

Even though you deny that the Wii is for kid's or is kid oriented, it actually is a kiddie console. Once the most popular games are not "Mario has a party and hooks up with the Bratz" type games, and are more adult and mature themed instead of some cutsie animal or plumber it will always be a kiddie console to me.

I honestly have no desire to buy one, ever. The reason why? The games and the silly controller. If I wanted to swing my arms around like I'm casting some spell on you or like I'm playing tennis, I'll go outside and play tennis. Also, the online for the Wii is weak at best and honestly non-existent. That's something I enjoy and going online and destroying someone. And as far as the demographic that Bod posted for the wii and PS3 are incorrect. According to him, I should LOVE the Wii and despise the PS3 and 360. Funny, it's the other way around and will be more then happy playing the PS3 and 360 for years to come.

Wiigirl, is Rachet and Clank aimed more at kids or adults? That's silly to think that there were NO games for children on the PS2, and soon the PS3.

But anyways I digress, this is not a Bash Sony thread area, so if you feel the need to bash a company, do it in another section that I won't read. Like the Nintendo section.

@jjseth: he said "in general" ... because according to him, I should have liked PS3 more than Wii ... (which so far I think I'm more impressed about Wii and wanting to get one, though I can't really comment since I don't have either of those). Also, don't complain that people say there are no games for children for the PS3 (people agree that there are such games for PS2) when you just posted that all the games for Wii are kiddie...

I wish there existed some kind of Adult Gamers Asocciation or website which requested a formal apology from Sony for calling them kids indirectly, just because their console of choice is the Wii. That would be the end of companies trying to stick the kiddy image to Nintendo.

Sega started it, Sony extrapolated it. With the way Nintendo is still envisioning the Wii and the games that are coming for the Wii, it really won't deter people from still labeling it a "kiddie" console.

And when your main announcements are WiiFit and a new Mario Kart, oh boy.

Unlike most of you, I'm just disappointed in Nintendo.

My god. Tretton is in no position to be saying crap like that.

You can believe whatever you want, it won't stop you from being wrong. Once again, both anecdotally and statistically, there is now a wealth of information to support the hypothesis that adults (that is, 25+) are buying the Wii for themselves much more often than they are buying the PS3 or 360 for themselves. In general, I suspec the games they are interested in are not Super Mario Galaxy or Metroid Prime -- just as they are not Killzone or God of War or Gears of War or Warhawk or Warkilldeathzone. The games they are interested in, in my experience, are Wii Sports, Brain Age, and now Wii Fit -- and those are games that Sony and Microsoft don't have answers to (although MS has made public their desire to move in to this arena). 

I'm going to state this one more time, for emphasis: your belief that the Wii is only for kids flies in the face of statistical and empirical evidence. If you want to believe it's for kids despite all evidence that points to the contrary, feel free to close your eyes and believe it.