Checking age before calculating on the basis of IF condition

Hello Everyone,

I have prepared an excel to calculate Income Tax at predefined slabs. I need to modify it to some extent, so please guide me

I would like to add age condition too in it before calculation of Tax.

I am herewith attaching the excel that i prepared.

What i am trying to do is as following.

1st Column will be Amount which i will enter on my own

2nd Column - Date of Birth / AGE

3rd Column - Tax Calculation (As per tax slab)

Please check guide me.

Thanks