Two second step forms depending on data from 1st

Hello all

I would like to have a simple step 1 form.

Then depending on what people put in step 1, I’d like them to be redirected to one form if they say they are over 55 or a completely different form if they say they are under 55.

If we call the two-step two’s a and b, I’d like to have:

step2a sent to one email address
step2b sent to a completely different email address.

I’ve tried searching google but not found what I wanted.

Can anyone help? I use contact form 7 and gravity forms. But I am willing to try other free/paid systems.