How to Stay Young
The specific model this comic was written about is no longer available, but a similar product can be had for under $50.
On a related note, I think that seeing something really cool exists, and knowing that you could buy it, but choosing not to because the item serves no useful purpose in your life is one of the hallmarks of adulthood, and also is one of the reasons kids find adults insufferably boring.
As always, thanks for using my Amazon Affiliate links (US, UK, Canada).