Best way of explaining is using the gold analogy.
But I think explaining it to a person in his/her early teens will be quite diffiicult. Best to wait till the person reaches late teens and then explain
Yes ,it is so hard to explain to them especially if they are not interested to waste just like 2-4hours a day spending time to bitcoin .
But its easy to explain if the teenagers are openminded with business and money and they know how value each money that goes on their hands
what do you mean with wasting 2-4hours a day if they use bitcoin? you know that bitcoin is just like ordinary currency and works like that but the difference is bitcoin's getting used for digital transaction,and when you're going to make a transaction it's only took about 5 minutes to get done,so no wasting time at all