I've been in the same boat mikey........I'm 37
And yes,I've just posted about training to failure and had some great advice from commander and greatkeen.....
The injuries seem to stem from training to failure on every set.....which is what I was doing aswell.
I've now changed it to obviously still having a challenging weight but now I'm sticking to hitting 12reps with good form on set 1 and 2 and then on my last set go to failure,rest pause for say 20-30 secs then carry on till I hit failure again,rest pause for another 20-30 secs then go again till I hit failure and stop.
The way I look at it now.....that's by far enough to stimulate growth while avoiding injury.