As an owner renting out via SnappCar, you are in total control who can rent your car. You are free to accept or deny any request you receive. If you want to filter before users are able to sent requests, you can set a minimum age for renters. Verified SnappCar renters are all over 21 years old and have been in possession of a driver’s license for at least a year.
Unfortunately certain vehicles cannot be rented to drivers under the age of 23. You should think of vans and cars in a more luxurious/expensive segment.