"Un hombre judío con padres vivos es un niño de quince años y seguirá siendo un niño de quince años hasta que ellos mueran."

Simplified Meaning:

This quote is talking about how a person's parents can influence them for a long time. Even if someone is grown up, as long as their parents are alive, they might still feel and act like they are much younger. This is because parents often try to protect and guide their children no matter how old they get. For example, you might be an adult with your own job and family, but when you visit your parents, they still treat you like a teenager, giving advice or worrying about you. When the parents are no longer there, the person has to fully step into their own adulthood. It is like losing a support that has always been there, making the person truly grow up. To apply this in life, one can try to become more independent and self-reliant even while their parents are alive, learning to make decisions on their own. This way, they won’t feel as lost or immature when their parents are no longer around.