Not unusual at all. Everyone I know does this. Nothing wrong with you it’s just that age (and birthdays) becomes less important. Also once past a certain age you actively want to forget that you’re old, so you need to consciously think about it.
But don’t worry, once you get into your 80s it becomes a badge of honour and the older you get the more you’ll think about it.
Phones encrypt the data by default, your password or pin is also needed to authorise the connection with a computer.
However, many people do insecure things like storing passwords etc in Notes applications, or having simple PINs that are easy to guess, don’t update their devices, or even turning off security features (if they can) because they won’t take a small amount of time to understand them.