DOB means Date Of Birth Field, is this so?
Toolset cannot calculate values, and does not offer any feature to allow age calculation based on fields in general.
What you can do is hide or show content based on other content - so for example you can show a field only if another field has value XY, or is not empty, or else.
This is done with HTML conditional, as elaborated here:
https://toolset.com/documentation/user-guides/conditional-html-output-in-views/
Hence, assuming your user is a logged in WordPress user, would like have the DOB saved as a User Field, and using that, you could wrap your content in HTML conditionals, that either check on that date or (with some custom code) calculate the time passed from that date (age) and show or do not show the content that is considered delicate.
Without real WordPress users, this will not be possible, as the user data cannot be retained - and that needs to be done so ether code can work on some existing data.
If your users do not log in but are just "guests", I would rather suggest to create a catch all solution, where the user - before he or she even reaches the page with the delicate content is asked wether or not they are 18 (example).
Then, depending on what they click (yes or no) you would redirect to certain pages or views that list full contents or not.
This still brings the risk that a User can reach the URL directly, as they are not logged in, you have no real chance to block them either (with Toolset Access for example), as the data they provide simply is not retained.
Maybe I can come up with a bette solution if I know more about the precise process you have in mind, and what the user will be (logged in or not)
In case you want to do this in a Toolset Form it is very similar:
You would use HTML Conditionals, but you will need real data, saved in the database, to have that working.
If there is no data saved, you will eventually have to fall back to Custom JS that is able to read data in the browser and update the content on the fly.
