Mine was made 9/23/16 and is going OK.
I store winters on a trickle. Summers I don’t use air much, do run the stereo, always turn off auto stop/start, run mostly country anyway. The battery is usually around 12.5v +- a very little.
I feel lucky to have it last this long, but yours is that old too. If it fails this spring, I’d feel like I got my money’s worth.
I do plan to just use OEM. All that shopping to save a few pounds would mean nothing on an otherwise stock car. (lazy)
BTW, it was on Buffalo news this morning, today is National Battery Day. ? Really ? Who thinks that up?
Does your RS still auto stop/start?