For what it’s worth, Joe Fosco estimated there were 40-50 made guys in the Outfit circa 2012.

This has been discussed extensively on these boards. The takeaway is that at least half of those who can be identified, e.g. reconciled with the FBI’s older list of 28, are now tilting toward the deep side of geriatric.

Anyway, as far as I know that is the most relevant and probably unbiased guesstimate made in recent years, since the FBI is keeping quiet.