What Type of "Back In The Day" Will Our Children Have To Refer To 20 or 30 Years From Now?

We often use the phrase "Back in the Day" with great affection and fondness as we reflect on a period of time that is usally 10, 20 or 30 or more years ago. Usually the phrase is used to refer to what was considered a good time to be alive or to be doing whatever the speaker of that phrase was doing. My question is, what type of "Back In The Day" will our children today have to refer back to?