If I had 12 years old, how would you do this orderly with steps?

Ask the person to multiply the first number
of their age by 5.
Tell them to add 3.
Tell them to multiply the total by 2.
Make them add the second number of their
age to the figure, and have them tell the
answer to you.
Deduct 6 and that will be their age!
(On ages below 10, no need for step 5. Just
remove the second digit.)

1. Ask the person to multiply 1 (the first number of their age) by 5: 1 x 5 = 5

2. Tell them to add 3 to the total: 5 + 3 = 8
3. Tell them to multiply the total by 2: 8 x 2 = 16
4. Make them add 2 (the second number of their age) to the figure: 16 + 2 = 18
5. Deduct 6 from the total: 18 - 6 = 12

So, if the person's answer is 12, their age is 12 years old.

But, if I had 6 year old, how would you do it?

Since the person is only 6 years old, we don't need to add the second number of their age in step 4. Here's how you would do it for a 6-year-old:

1. Ask the person to multiply 6 (the first number of their age) by 5: 6 x 5 = 30
2. Tell them to add 3 to the total: 30 + 3 = 33
3. Tell them to multiply the total by 2: 33 x 2 = 66
4. Deduct 6 from the total: 66 - 6 = 60

So, if the person's answer is 60, their age is 6 years old.