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Accurately determining the age of H\,{ii} regions and the stars they host isas important as it is challenging. Historically the most popular method hasbeen isochrone fitting to Hertzsprung-Russell Diagrams or Colour-MagnitudeDiagrams. Here we introduce a different method for age determination usingBPASS and hoki. We infer the most likely ages of the regions D118 and D119 NGC300 to be log(age/years)=6.86$^{0.05}_{0.06}$ and we also deduce stellar massand number counts by comparison with the BPASS models. We compare how ourbinary and single star models perform and find that the latter are unable topredict 20 per cent ($\pm$ 10 per cent) of our sample. We also discuss howresults obtained from isochrone fitting would differ. We conclude that agescould be underestimated by ~0.2 dex and that the limitations of the isochronemethod is not solely due to the lack of binary stars. We propose that themethod presented here is more reliable and more widely applicable since it canbe used on smaller samples. Alongside this study, we release new hoki featuresto allow easy implementation of this method.

A systematic aging method I: HII regions D118 and D119 in NGC 300