Honestly Cass, I think there's a lot more to talk about on GN other than lipsticks, babies and boyfriends.
Grandmas, are representative of the population per se, and not a homogeneous mass who all act in the same way, you only have to scan many of the threads on this site to gauge what posters are passionate about, I can guarantee it's not usually lipstick! Whilst there are a few threads that pertain to "beauty" make up, appearance etc. etc. I'd say they are thin on the ground. I still colour my hair, but that's incidental and not something that I feel the need to discuss in any great detail, what's to say on such a subject, not a lot!
Welcome to GN take your time to browse the various threads which are varied and hopefully you will find some that interest you.