Do you remember your first trip in an aircraft? How old were you? Where did you go?

I was going to say 18 and it was to New Orleans, but then I remembered as a kid, I went up in a small aircraft. It was some type of charity event and they charged by your weight. My mom refused to be weighed so the rest of us went without her. 

Never been on a commercial plane.
Been in a single prop and helicopter.  Not much interest in flying to be honest.

Yes, I remember it vividly: I was 18 years old and I boarded a plane bound for San Diego, California to enter Marine Corps boot camp. 
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Yes, I remember it well. My Uncle took me up in an old AT-6 trainer plane when I was 15 and scared the heck out of me! But the rush was so cool that from there on in? He taught me to fly at 15 and I learned to fly all his vintage WW2 restored airplanes. Love to fly but the Docs grounded me a few months ago.

I know I was not old enough to remember them being called aircraft.

And I am old.

        I was five years old and we flew from
    the East Coast to the West Coast of the US.
             Connecticut to California

My first time in an aircraft of any kind was when I was 21.  It was for my honeymoon vacation.  My first flight was from Watertown, SD to Minneapolis / Saint Paul then from Minneapolis / Saint Paul to Frankfurt, Germany.

I was 6 and flew to Daytona,FL