My photography has always followed whatever else I was interested in - I wasn't interested in photographer per se, only as much as it enabled me to record my other interests, which varied. Of course I followed the various trends and educated myself as to what other proponents of whatever genre was interesting to me, but for me the subjects were and are the hobby.
As a teenager, I photographed my friends, bands, festivals etc, because that's what I was doing at that time.
As I got into cycling and mountain-biking, I photographed that and even got some stuff published - and paid-for.
When I joined the Army I recorded all of that; colleagues, training, overseas deployments, Northern Ireland, etc. eventually transferring from the Infantry to being a full-time Army Photographer, covering the wars in Bosnia, Kosovo, Iraq and Afghanistan. At the same time I moonlighted doing weddings and other social events at discount prices for the lads in my Units. One of the side-gigs was doing Portraits at Mess functions and was incredibly lucrative, as most Garrisons had at least a dozen Messes - officers and SNCO's, Regiments, Corps and Garrisons - and we charged a small fortune to set up a booth and do on the spot printing. Christmas could easily earn me @£8-9k covering an entire District. The guys in London District probably earned twice that.
When I left the Army I tried my hand at social and wedding photography - for about three years - until I realised that despite being 'able' to do it, I wasn't motivated to continue because the subject didn't interest me in the slightest. Unlike Military weddings, there was far more work involved and unlike working with Military subjects, I found I had to be way more diplomatic, which wasn't really me.
Same with Sports - I covered a lot of Sports in the Army and using some of those images as collateral, picked up a gig as in-house photographer for a local 2nd Division League basketball team and covered all their games for a season, selling images to the local press and websites. It bored me to death after the first month.
Once you've shot one wedding (with attractive clients in a decent venue), you've shot them all. One decent match and you've seen them all.
The one thing that's remained constant though is women. Since I was 8 years old (and I remember the event that triggered my interest like it was yesterday), I've always found women to be utterly fascinating. So I've always photographed them.
When I was younger it was mostly portraits, or candids of my friends, then 'fashion' (today we'd call it 'lifestyle')... As I got older I managed to convince some to wear less clothing, wear no clothing at all or even to wear baby-oil and be quite rude, sometimes alone and sometimes with a second female.
So in one sense my photography has changed radically over the past 48 years; in another it's stayed exactly the same.