All people use cash Unlike bitcoin, only the person who have internet can use bitcoin and those people who really want to have bitcoin. That's why cash is better than bitcoin. Even adult or young know and use cash.
Those who can use bitcoins are those who have the capacity to use and access computers and internet. Like what you said, cash is better than bitcoin as of this moment because all age and level of society can use it. The fact that every part of the world do not use internet and still no access to technology, cash is still the best currency to use.