  We combine a number of recent studies of the extended main sequence turn-off
(eMSTO) phenomenon in intermediate age stellar ($1-2$ Gyr) clusters in the
Large Magellanic Cloud (LMC) in order to investigate its origin. By employing
the largest sample of eMSTO LMC clusters so far used, we show that cluster core
radii, masses, and dynamical state are not related to the genesis of eMSTOs.
Indeed, clusters in our sample have core radii, masses and age-relaxation time
ratios in the range $\approx$ 2--6 pc, 3.35- 5.50 (log($M_{cls}$/$M_\odot$) and
0.2-8.0, respectively. These results imply that the eMSTO phenomenon is not
caused by actual age spreads within the clusters. Furthermore, we confirm from
a larger cluster sample recent results including young eMSTO LMC clusters, that
the FWHM at the MSTOs correlates most strongly with cluster age, suggesting
that a stellar evolutionary effect is the underlying cause.
