Input date of bith to calculate age

Hi there,

I need to ask clients date of birth as I plan to integrate the results with an application form via excel. 

However, I also need their age for the calculation below, is there a way to calculate their age from the DOB xo I don’t have to ask for DOB and age? I have 5 different age brackets for the calculation

Based on your current gross income & age you can contribute €v_contribution per annum to your pension with full tax relief

https://diarmuid974625.typeform.com/to/dkkpbF2k#u30result=xxxxx&thirtyto39result=xxxxx&monthly=xxxxx

Thanks,

Diarmuid