How to freak out a four year old

Jeremy told this story the other day:

So this morning the kids said “only 5 more weeks until summer break!”

I (Jeremy) responded with “Only 35 more years until I can retire!”

Then Ruth says “I can’t wait for you to retire so you can spend more time at home with me.”

Then I said that they would be long out of the house by the time I retire. Then I said “Hannah, you will be 38 when I retire.”

She said “Ah!!! You just freaked me out!”

(Hannah will be four in June).