Improving Star Cluster Age Estimates in PHANGS-HST Galaxies and the Impact on Cluster Demographics in NGC 628

A long-standing problem when deriving the physical properties of stellar populations is degeneracy between age, reddening, and metallicity. When a single metallicity used for all star clusters in galaxy, this can result $`$catastrophic$'$ errors old globular clusters. Typically, approximately 10 - 20 % detected spiral galaxies have ages that are incorrect by factor ten or more. In paper we present pilot study four (NGC 628, NGC 1433, 1365, 3351) from PHANGS-HST survey. We describe methods to correct age-dating clusters, first identifying candidates using their colors, then reassigning reddening based on lower solution. find young $`$interlopers$'$ be identified Halpha flux. CO (2-1) intensity presence dust also used, but our tests show they do not work as well. Improvements success fraction possible at $\sim$ 15 level (reducing catastrophic age-estimates 13 21 3 8 %). large incorrectly age-dated systematically given around 100 Myr, polluting younger Incorrectly significantly impact observed cluster age distribution which affects interpretation disruption galaxy. For demonstrate how fix second major problem, where very dusty with E(B-V) $>$ 1.5 mag assigned old, globular-cluster like ages. Finally, note discovery dense population 300 Myr central region 1365. discuss results naturally dynamics barred