The question of youth - shall i be happy or sad?

Case 1 Venue: Foon Hew High Shcool, Johor Bahru. I was on an education fair. While I was excitingly explain the Mechanical Engineering course to a student, he suddenly popped up with this question: Which year are you in now? --- WOW... what a nice feeling! I am close to 30 now, and yet been asked on what undergraduate year I am in! Case 2 Venue: INTI College Subang Jaya It was a team building camp for the secondary school teachers. I was part of the facilitating team. Together with me were students from INTI Subang Jaya. While Mr. Boh was conducting the evemt, some of us was chatting at the back - since we have nothing to do... then one student asked me: What semester you are in now? --- WOW... am I look like a student? this is great! Case 3 Venue: KL International Airport I was seeing my student LC off to UK. There was a representative from an university chatting with us. I commented that the Leeds sweatshirt may not be good looking, as the wording on it was not as much (LEEDS), but this guy went: So you should choose to come to this univeristy (this university has 10 characters) next time you are going to UK... --- I was thinking: WHAT??? I am not only look younger in other people's eye, but now look younger than MY STUDENT........ becomg my student's junior..... Well, shall I be happy because I look younger, or shall I be sad because I don't look mature enough as lecturer?...