Batteries age even with 0 cycles, especially if they are kept charged to 100%.
That may be true with recent Apple OEM batteries today but I have a feeling that older OEM batterries were superior. Why?
I have a 2012 15" MacBookPro9,1 Core i7 which is generally always connected via the charger and in use daily. Several times a month I disconnect from the charger and in use allow the charge to fall below 60% and occasionally to 0%.
I've just checked and today the battery status indicates 97%, with cycle count of 903 also with condition status 'Service Battery' (which of course I won't until it no longer holds a reasonable charge). So to date that's 12 (TWELVE) years with the original battery which still appears reasonably healthy.
I can't help wondering how many Apple Mx laptops will still be chugging along with their original battery in 2031 and beyond!