Legend of Kyrandia 1 was the first I ever played, or rather, played with my father. I was by that time about 6 years (or maybe 5?), so it was more him who was controlling the cursor and translating everything for me (I am not a native English speaker), but we did solve the puzzles together
The first I played 'all on my own' was Conquests of the Longbow. My father and I got stuck on that some years earlier, and never finished it....
...until a few years later I just realized the solution
My father wasn't into adventures anymore by that time, so I played it on my own, and was re-addicted ever since
