How do I summon an item that despawns after a custom period of time?

How can I summon an item that will despawn after a specified number of minutes, as opposed to the default 5?

I tried

/summon Item ~ ~1 ~ {Item:{id:minecraft:planks,Count:1,Age:1}}

but the item always despawns after 5 min no matter what number I specify for the Age.

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