And I don't mean common sense! Hahaha! As I grow older I find a lot of my memories are triggered by my senses. Visually - obviously pictures, mementos and other tangible things. A lot of times songs I grew up with invoke nostalgia as well. Whenever I listen to songs I am transported to my formative years - I am not good with lyrics so sometimes I search for the lyrics online. I wouldn't go as far as searching for guitar stores near me to make a point about my nostalgic sense.
I also find my olfactory sense can trigger a lot of memories which I associate with events or moments in my past. I know a few people feel this way too, but I wonder if this is true for most people in general. Hmm.
At the moment, I am listening to my playlist which includes "Fields of Gold" by Sting! My ultimate favourite! Oh, I am now on a road trip. Just like how it used to be before.