Yah. I'm sure those bibical parent would have let their kids go off with any stranger that came along.
By the way, what responsibilities did a 30 year old have then that a 20 year old didn't have? Some of the apostles were fishermen, one was a physician. Both positions suggest age, not youth.
Christ didn't start his ministry until after he was 30. Don't you think he would have started it earlier if he could have? Now, why would the apostles be able to galavant all over the countryside if Christ couldn't?