I'm a decade behind you and would be more than happy with a VO2 Max of 59

My current Garmin estimate is 51 (down from 55 a few months ago), Fitbit has me considerably lower at 42-46 (down from 47-51). But I am slightly down on power across the board from my summer peak. So the trend of VO2 max is at least believable, even if the estimated values are very much dependent on the App model assumptions. W/kg on the other hand is what it is within about 1%.