Word Press Developer Gravity form work needed.

We need a WordPress developer with experience in Gravity Forms.
Our booking form contains Date of Birth, Passport Issue Date and Passport Expiry Date fields.
The year selector on these date fields only goes back to 2016, meaning customers cannot enter older dates of birth or passport issue dates.
We need the date picker configured so that:
Date of Birth allows years back to 1926.
Passport Issue Date also allows an appropriate historical range.
Passport Expiry Date should continue to allow future dates as appropriate.
This is a live website, so the fix should be made without affecting the existing form or submissions.
Please confirm:
Your experience with Gravity Forms.
Your estimated time to complete the fix.
Your cost.
We can provide WordPress administrator access once we've agreed to proceed.