So I have this riddle and I need help and it goes like this:

When I was 6
My sister was half my age
Now I’m 70.
How old is my sister?

When I was 6

My sister was half my age

How old was your sister then?

How much younger than you was she?

How much younger than you is she now?

6/2 = 3

Take it from there.

Actually this isn't a riddle. It is a math problem.

To solve this riddle, you need to think logically and apply some basic mathematical calculations. Let's break it down step by step.

1. When you were 6, your sister was half your age.
This means your sister was 3 years old when you were 6 since half of 6 is 3.

2. Now you are 70.
There is a 64-year gap between when you were 6 (earlier) and when you are 70 (now).

3. To determine your sister's age now, you need to subtract the 64-year gap from your current age.
So, subtracting 64 from 70 would give you 6.

Therefore, based on the given information and calculations, your sister is now 6 years old.