HI, Andrew
I'm 65 and started with GT about two and a half years ago. And I'm also left handed.
Worked my way through Lisa's GF I and II, then finger picking. Tried some blues and I'm now working through Mr Schlegel's Classical studies. I'm REALLY glad that I started learning on the right hand guitars. Both hands are doing different things, so I don't really see that being left or right handed ultimately makes a difference. My fingers still tend to do what they want on BOTH hands sometimes, and I have to slow it down and make them behave.
Eventually muscle memory takes over for both and I can make a reasonable facsimile of "music".
Whichever you ultimately choose, remember...it's supposed to be fun.