My journey began in the early 80’s and I have been in this hobby about the same time as you, a little over 40 years. I am also at a point where I just don’t want or need anything else. I ended up accumulating more components than I can keep track of. They are either set up in one of six rooms or in a closet somewhere. From time to time, I’ll give something away to a nephew, who’s beginning to enjoy this hobby at the age of 14. Too bad I find his choice of music genres awful. Hopefully he’ll grow out of that.
If I had to choose one component it would be a pair of Acoustic Research AR9 speakers that I bought very early on, also in the 80’s. I have gone through and have many speakers, but those continue to be my favorite. I continue to enjoy music very often, but the stereo buying bug has for the most part gone away.
I did buy a DAC not too long ago and then ended up buying 3 more for other rooms once I realized how convenient streaming was. Guilty as charged, but I had to "modernize"! 😎