coeval
(the same age)
The word coeval means the same age, i.e., equal ages.
The word is used in astronomy in relation
to astronomical objects, e.g.,
"The stars in an open cluster are generally coeval".
(objects,age)
Further reading:
https://en.wiktionary.org/wiki/coeval
https://dictionary.obspm.fr/index.php?formSearchTextfield=coeval&showAll=1
Referenced by pages:
globular cluster (GC)
lithium depletion boundary (LDB)
main sequence fitting
metallicity (Z)
stellar age determination
Index