How to know if you look younger than your age?

Do I really look younger than my age as what some people with vision problem say so? haha This morning i took a jeepney ride from Munoz to our office. Since the distance between the point of origin and our office is less than 4 kilometres, the supposed charge is the minimum fare - Php 8.50. I reached a ten-peso coin from my pocket and (as i was seated at the rear side of the jeep) at the top of my voice, I yelled, “bayad po” to prompt other passengers to reach for my fare and hand it to the dirty hand (with untrimmed fingernails stuffed with mixture of grease, dead skin cells and dandruff hahaha) of the driver. I ought to receive Php 1.50 change but to my great surprise, i received Php3.00. I was astonished and taken aback. We were only five passengers and the driver has a clear view of me at his horizontal mirror. Or perhaps to his discretion, i am only a high school student hahaha. Discreetly, i opened my phone’s camera and swiftly took a picture of me purposely to determine whether i look like a senior citizen or a student. Stating the obvious, the latter is more probable haha.
The issue to be resolved next is whether or not i will return the Php1.50 excess change. but while thinking what will i tell the driver, i realized that our office is just a couple of meters away so i merely said, “para po” and gave him not the excess change but my biggest and most friendly smile.