Bald man trouble

On our way to our car in a busy parking garage, we walked with an older gentleman. As do many people, he had to comment on my children's blond hair. "I used to have blond hair," he stated. "But then it all fell out." He pulled off his hat and ruefully rubbed his bald head. Amy stared at his bald head in amazement. I could only imagine the connection she was making--he had blond hair and now he's bald. That means I'll be bald too, someday???
Sure enough, as we walked toward our car she asked me, "Mommy, will my hair fall out too?"
"No sweet," I reassured her. "I don't think you will lose your hair.
"But mommy, why did HIS hair fall out?"
"Because he's very old. Sometimes old people lose their hair."
"Oh, is he very old. Like is he 60?"
"Uhm, I don't know how old he is, maybe he is 60."
"Are you 60 yet mommy?"
"No! I'm 32."
"Why are people who are 60 old?"
So yes, why are people who are 60 old? That is a loaded question....