Ultraxan Star Cluster located 45 light years from Earth hosts many stars. Judging by the Blue Super Giant suns it is unlikely that this star cluster is more then 20 million years of age.
There is a very short window of time to sprout life within the cluster since when blue super giants burn out their most of their hydrogen, they begin burning helium and swell, when that runs out they go hypernova. Blue Super Giant stars usually do not live past tens of millions of years. But 10 million years to a humanoid is plenty, hence Alasuya have already begun terraforming and paraterraforming worlds within the cluster.
This is my 3d starfield.
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