Difference between two date timestamps month wise and year wise

Monthwise difference between two dates(timestamp)

select 
    (
        (DATE_PART('year', AgeonDate) - DATE_PART('year', tmpdate)) * 12 
        +
        (DATE_PART('month', AgeonDate) - DATE_PART('month', tmpdate))
    ) 
from dbo."Table1"

Yearwise difference between two dates(timestamp)

select (DATE_PART('year', AgeonDate) - DATE_PART('year', tmpdate)) from dbo."Table1"

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