First of all, I would like to stand up and applaud you for coming into the world of horses at an older age. Seriously, major props.
Ugh. Older age. I don't feel "older!" But I guess 42 is pretty ancient to just be getting started, so I forgive you!
As for discipline, I'm riding western right now. I don't know where I'll ultimately wind up, but given my advanced years, I don't foresee competing. I think it will be mostly about enjoying the great outdoors with a good horse under me. And that seems like a decidedly western pursuit.
I do have a curiosity about reining and cutting and may attend some clinics on those later I get the basics down.
The English disciplines...I don't know. They're amazing to watch and I'm encouraging my daughters to try them (we are learning together as a family). But I don't think they're for me. It's not that I fear the breeches - but it would be real injustice to subject anyone else to having to see that.
Ironically, I'm learning western riding from an English instructor! Not sure how long that can last. My wife and daughters may continue to learn from her, but there will come a time when I want more out of western than she can provide.
Already she's got me doing this weird hybrid thing where I'm riding in a western saddle, but direct reigning (I try not to call it "plow" reigning around those decidedly English stables) with English reigns attached to a western bridle. It feels very awkward and formal. Not quite what I'm looking for.
I'm going to see how it progresses for awhile, and if I get the sense that I've exhausted her western tutelage skills, I'll find someone more suitable.
Long answer to a pretty simple question...sorry...