Guns are one of my primary hobbies, although I haven't invested much in equipment yet, relative to the others--that's because I invest in learning as much as I can first, and I'm still at an early stage in that regard. It will probably take me a fair number of years to reach any level of expertise, by my own estimation. My other primary hobbies are:
Amateur astronomy - Currently only observational, although I will eventually get into electronic sensors and astrophotography (I'm using my eyes for old-school astronomy while they're still good, and I'm fortunate that they are very good despite decades of using computers and reading books). I've studied and observed the sky since childhood, and probably know it better than the planet that I live on.
Vintage computers - I've been programming and using them since I was a child, they helped set me on my career path, and I never stopped loving (as much as one can love machines, anyway) and in fact using those old 8-bit and early 16-bit computers of the 1970s and 1980s.
Home theater - The eternal quest to experience movies as they were intended to be experienced, which involves simply too much to summarize.
Fountain pens - Quite interesting from a historical and cultural perspective, and I still use them. Like most everybody else I hardly write much down by hand anymore, so I only have one fountain pen inked at a time. Currently, it's my 1960s vintage Sheaffer Snorkel (Sentinel model), probably the most complex and advanced fountain pen ever devised. It's cool, it's nicer to write with than modern pens (virtually no pressure required), and it's a durable, high-quality piece of American ingenuity and manufacturing from a bygone era that I can still use as a practical tool today. I actually used a fountain pen in elementary school, and it sure drew a lot of attention at times.
Disney - Not most of the new crap from the bloated conglomerate using that name, but the classic stuff, as well as the theme parks, particularly Disneyland. Amazingly the shooting gallery is still there (infrared since the 1980s, but it used to have air pellet guns, and there was another gallery that had .22 rimfire rifles in the 1950s
), and they've brought the guns back to the Jungle Cruise ride (real .22 LR revolvers shooting blanks that you can hear quite far outside the park
). The last time I was there, I saw several groups of kids playing with the cheesy post-Columbine orange & green-colored toy flintlock/caplock guns, but they still knew what to do with them (i.e. pretend to maim and kill each other
).
I also dabble in a bunch of different fields, such as electronics, that may someday become hobbies if I ever get bored or have more free time.