Planetary mass-radius diagram for a sample of characterised young transiting planets as a function of the stellar age (left) and planet insolation (right). Coloured circles indicate planet with measured mass, while triangles indicate planets withmass upper limit only. Grey dots represent a sample of well-characterised mature exoplanets for comparison. Dashed lines represent loci of equal density, as indicated at the top of the figure. Hatched rectangle indicates the locus of the final mass and radius of DS Tuc A b, according to our planetary evolution models.