Books

Authors

Age at Release

prop("Released")
	.dateBetween(
		prop("Author")
			.first()
			.prop("Date of Birth"),
		"years"
	)

Age

now()
	.dateBetween(
		prop("Date of Birth"), 
		"years"
	)

Age at Earliest

prop("Books")
	.map(
		current
			.prop("Released")
			.timestamp()
	)
	.sort()
	.first()
	.fromTimestamp()
	.dateBetween(
		prop("Date of Birth"), 
		"years"
	)

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</aside>