Elixir Nano PBs. Gauge is up to the individual - I used to use 13-56 but, since the arthritis in my almost-78-years-old hands took hold, I’ve dropped down a gauge to 12-53. There’s no shame in dropping down to 12-53, it’s your own ears and hands that are most important, what others use, or what they tell you you should use, are completely irrelevant.

I’ve also used D’Addario XS PBs in 12-53 and 12.5-54 (Light Plus). Good strings, pretty much on a par with Elixirs IMO.