Hello people once again!! I was just thinking about my oldest villager who is 84 and was wondering whats the best thing to do to let them live longer??

Anyone who has a villager ages 90+ or even 100+ \:o can you share a secret if you have one, on how to get our little villagers to live longer ;\)
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I haven't been on the forums in a long time, I hope you all remember I am a boy grin