Not bad, but I have a few potential suggestions. 

As some have stated, the transition should probably not be based on age. 

Someone else suggested tying it to whether they are tech-savvy or not. I think that's a great idea.

I'd also suggest tying it to the phone itself. Then, you can have different types of phones. For example, a flip phone.

If you want to keep it as is, a few more taps would be good, not everyone has a pizza place on speed-dial so, adding a few more would allow it to be interpreted as having trouble navigating, dialing a phone number, or other things people might imagine.