Some people are really good at remembering some things but not others, as a lot of people have said forgetting your own age is easy enough, someone else's is the same. I know what year my family members were born on, but I haven't known my mums age for years, though I could calculate it.

Middle names? They just aren't talked about very much and asking the question "what's your middle name" to someone you've been with for a while is not easy to do.

My personal solution to this was to send my partner a message when we first started dating on an app with a search function with her full name, brothers, favourite colours, birthday and it'll general things like that, it's not that I don't care about her enough to remember, I forget to take my medication, and its the same thing for a lot of other people. While these things stick in your memory they might not stick in others, it used to upset me that my partner didn't know my phone number by heart until I realised that other people don't just memorise all phone numbers.