Is there a way that you can show or hide certain information in your profile like your age?
The only way is to hide is on profile view. Here is a quick video on how to https://nimb.ws/9S3NXF
Also, do it for "Full View Person" as well.
There is no option for the user to hide their age at the moment.
In UNA 12 appeared the Privacy settings for fields. Firstly, the UNA operator enables the privacy for the field(s) and then the users may set who has the access to look to their info in those field(s).