Since when does it prove that? You can find many examples of people who actually did invent great things late in their lives. Of course you have more free time when you are your teens and early 20s, but what comes with experience is valuable as well.
Replace "some" by "all modern" and you'll get it right. All the phones I've had could call 112 without a sim card. If you're paranoid, consider this:Ah ok, it's still a module ! Thought not.
@WizardStan, some phones can call emergency numbers even without simcards. I was told that in first aid courses three years ago.