How do I answer an argument regarding the morality of the prophets marriage?

I were commenting against someone who was talking about the marriage of the prophet pbuh and Aisha peace be upon her too. The person I was commenting against said something like why would God let the perfect model for Earth marry a child when we know in today’s society that it could cause numerous health problems if a man and a young woman were to engage in sexual relationships and that it would leave people committing illegal acts in today’s society. God would’ve known that marrying people significantly younger or older can be bad so why would god set out such a bad example for the humans even though the prophet was supposed to be the perfect example. Please include Hadith and Quranic verses if possible.