I am 67 years old. That being said, I am technically proficient...I've forgotten more than these young "whippersnappers" have learned. <Ha!>
I have just had an incident (an old man incident) that embarrasses me (!) regarding earphones. I, three times in as many days, plugged my earphones into the improper jack. Dadgummit! I could hear something but it wasn't near loud enough. The microphone jack does have audio, as I've found out. It's just not normal volume.
Were all my problems as simple to solve.... <YeeHah!>
Jack