GHS143 (red circle) in the colour magnitude diagram compared to two isochrones at metallicity −1.65 highlighting the ranges for possible solutions: 500 Ma (black and pink, the evolution stages for the first two solutions) and 1 Ga (dark blue and light blue, the evolution stage for the third solution). The solution with the Gaia DR3 parallax (large green square) adopted in Paper II is compared to the isochrone with an age of 200 Ma (green points).