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Create immutable entry based on lookup

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ECTA
5 - Automation Enthusiast
5 - Automation Enthusiast

I have a "Person" table that has birth date. On another table, I lookup that birthdate to find the person's current age when "Event" happened. Next year, a new "Event" will have different age for the person (as they are a year older). But I need to know what age they were at each "Event"

So how do I create a column of ages that are dynamic on entry, but don't change once they are entered?

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TheTimeSavingCo
18 - Pluto
18 - Pluto

Hmm, in the "Event" table, create a Date field called "Date of Event" or something, then create a formula field that will calculate the age by deducting the birthdate year from the "Date of Event" value year?

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4 Replies 4
TheTimeSavingCo
18 - Pluto
18 - Pluto

Hmm, in the "Event" table, create a Date field called "Date of Event" or something, then create a formula field that will calculate the age by deducting the birthdate year from the "Date of Event" value year?

ECTA
5 - Automation Enthusiast
5 - Automation Enthusiast

Won't this formula update that result next year? OR are calculated fields only calculated once upon entry?

Hm, I was thinking the formula would caclulate the difference between the date of the event and the linked person's birthday, and so there'd be no updates regardless of the current date

ECTA
5 - Automation Enthusiast
5 - Automation Enthusiast

Got it. I misunderstood. Thanks!