The article (Ideal Body Fat Percentage Chart: How Lean Should You Be?) lists two different idea body fat percentage charts:
Note the references to Jackson, A., & Pollock, M. (1978). Generalized equations for predicting body density of men. British Journal of Nutrition, 40(3), 497-504. doi:10.1079/BJN19780152 (Full Text).
By age (second chart) my ideal body fat percentage is 20.9%. At a LBM of 144.4 lbs, that’s:
144.4 / (1 – .209) = 182 lbs or about 10 lbs to go to that goal.