Back in the 1970s, when I was a teen-aged nerd, being a nerd was horrible. People made fun of you, you couldn’t talk to girls, you probably had bad clothes and bad glasses.
Being a nerd when you’re in your 50s is entirely different. You’re probably being paid for many of the qualities that made you a nerd in the first place.
There’s no need to (attempt to) hide your nerd status, since everyone around you already knows you’re a nerd and accepts you for that. Besides, there’s a lot more social acceptance for nerds and you are also probably hanging around with–or are married to–other nerds.
You may also find that you just don’t care as much what people think of you!