When I was 2 years old, my sister was 1/2 my age ==> she was 1 ==> she will always be 1 year younger than I am, and she will never be able to catch up to me.
Now I am 100, so my sister must be 99 .
You are currently 100 years old, which means your sister, being 1 year younger than you, is now 99 years old.
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