If you are in constant pain from the tear, surgical intervention is likely needed. If the rotator cuff can't be fixed, the other option is a reverse total shoulder replacement.

I'm 71 and 10 months out from an anatomical TSR on my left shoulder. I have worked hard and am very happy with the results.

I suggest talking through these options and others with your surgeon.

As for gel injections in the shoulder - the FDA has approved for the knee, but not for the shoulder. you can still get the injections if your Dr agrees, but they won't be covered by insurance, are expensive, and only provide temporary relief, if that.