Just a few days ago when I was going to my drum class, I was in a train and about to go down in one station, but the train is packed with people. And there was an oba-san holding her kid with her hand, and they were blocking my way out. And then when she noticed me, she mentioned to the kid:
"Let go of my hand first; oji-san will pass through"
Then in my head I was like: "wtf... 'oji-san'?? I'm not even in my 20's!~ XO"