Not yet, date of birth is not a mandatory field under Open Banking. The good news is that we are looking to get this Data via the Premium APIs that we are putting together with individual banks.
We’re constantly talking to partners to source this data, but these conversations can take time. Therefore we can’t confidently predict when this data will be widely available.
If interested in this feature, feel free to add it to our feature request section. Upvoting this feature request gives evidence we can include in conversations with partners.