It can and does, rightfully you can use reasonable force proportionate to the circumstances. Details are limited in this case but if it’s anything like this
https://www.independent.co.uk/news/...ar-richard-osborn-brooks-london-a8896651.html then maybe the farmer had no choice to do what he did.
The age argument only goes so far, the surviving accomplices have been arrested for aggravated burglary implies weapon/s were used and a degree of planning went into it.
I think you’re devaluing the impact of the initial crime on the farmer and diminishing the wider effects that crimes like this have in rural communities.