Definitely not too old, Wicksay started a thread a while ago now and there's a lot of 50+ Students on here [including me ].
And, as you are a farmer, I'm sure you a very used to the weather thwarting your plans, so I suspect you are also better mentally prepared than a lot of us
I'm towards the end of my PPL Training now, technically I would have done enough )apart from skills test) to have gained LAPL but the extra hours seem to be where a lot of the 'really good stuff' is to be had. I'm now very comfortable in the air and am enjoying the flying and working with my instructor from a basis of having reasonable basic skills (unconsciously competent).
I think, even if I had gone LAPL I probably would've spent the extra money and time on further training anyway; and I wouldn't have a licence that I could add additional rating to either, so I'm fully on board with others who have recommended PPL.
Go for it and good luck!