I believe you are getting your data from the Graf 2015 study. The way I read the data, the FFMi of 19.5 is the floor of where you want to be for protective effects of fat free mass with the curve leveling off somewhere around 22-23 and possibly decreasing above that.
Therefore, an ideal FFMI for men should be somewhere around 19-23 with women offset about 3 points lower (16-20). This of course assumes a high VO2 max (40+ for men) as the effect of VO2 max on longevity appears to be about twice that of ideal body composition. Also assumes a low body fat percentage (10-18% for men, 20-28% for women) which also optimizes for longevity.
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