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Only, I am using a float.

from custom_interfaces.msg import Age

...

    def on_shutdown(self):
        self.age.year = 2022

isn't 2022 an int?

at least Python seems to think it is:

>>> type(2022)
<class 'int'>

To make it a float:

>>> type(float(2022))
<class 'float'>

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