Whether the comic strip is making fun of old people or "people who don't upgrade the basic things in life that make our lives simple" or not it's not the primary joke- just an amusing secondary (if you're not offended).
The joke is at people who use statistics to tease out superficial information without making any effort to examine all the factors that effect the results. The first panel in real life would go "we surveyed 1000 people" with no one ever pointing out the method by which they did the survey biased the results, but the joke would be a little too subtle then.
I don't know which is worse, those getting offended because it's making fun of old people; or, those denying that it's making fun of old people.
It's making fun of old people, that don't adapt with the times. This has been a subject of comedy since the first old person ever had a kid who had a kid, that decided to make fun of something.
Adams is not saying that anyone who doesn't have caller ID is behind the times, nor is he saying only old people lack a caller ID. He's just poking fun at old people that don't upgrade the most basic things that make our life simple. What makes it so funny is the stereotypes and innuendo....."hard candy and slight dementia". I thought it was hilarious, and when kids younger than me make fun of me for not having a myspace page, I laugh at myself.
Funniest Dilbert strip I've seen in weeks. Nowhere in the strip is old people mentioned. How can you see this as an attack on the elderly unless you in fact believe old people behave this way? You're only validating what you wish to discredit. Today's strip leaves the reader's imagination to fill in the blanks, and this is the essence of good humor. Don't get angry if you filled in the blanks with something you're uncomfortable with. Scott Adams is a genius.