The lifetime of a massive star before it begins to deplete its nuclear fuel is less than 5 million years (1). In contrast, the age of the galaxy is more than 10 billion
years (2); nevertheless, many massive and short-lived stars have been identified by observations at optical wavelengths.
These massive stars must have formed very recently relative to the age of the galaxy, and therefore star formation
must be occurring in the galaxy at the present time.

https://science.sciencemag.org/content/sci/197/4305/723.full.pdf

Spatial Interferometry of α Orionis and VY Canis Majoris at 10-Microns.

Citations

Infrared studies of star formation.

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