J, score 53.76
L = 47, M = 0.12
Takes M/F as 0/1 on the right side and age on the left side. A simple quadratic approximation. The J polynomials read from left to right, so 76 - 0.92x - 207e-5x² + 385e-7x³ for the 0 case. The 1 case just modifies the numbers a little bit.
p.~76 _0.92 _207e_5 385e_7+5 0.02 _14e_4 7e_6&*