We can confirm that the Disk population of stars contains both young and old stars.
What is the disk population?
This is a grouping term used to define the general grouping of stars regardless of age. As stated in the question, all of them have heavy elements abundances of about 2% heavy elements and are grouped together whether they are old or new in the star cycle.
Therefore, we can confirm that the Disk population of stars contains both young and old stars.
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