my birthday was last month, and i received what i think is a sort of a rude birthday card. the card basically says, "congrats on being old!". i'm approaching 30, so being called old is sort of sensitive and plays into misogynistic ideas about women being old when they are over the age of 25. at my birthday party, i tried to spin this as a joke because i thought my friend was just joking but she said that biologically we are losing muscle after the age of 25 and and so on. i felt it was unnecessary to bring this up because neither of us suffers from any age-related illnesses. the said friend is also a decade older than me and admitted to not doing very well due to anxiety over her career, while i have been quite successful in mine. this makes me think she might have projected her own insecurities on me and kinda soured my mood for the rest of the evening. although i explained to her how misogyny plays a role in society's view on women's aging and i don't find it particularly amusing, she didn't apologize for the card. when i was trying to joke around later in the evening to resolve the tension by calling us "the OLD friends" (the emphasis on old here as a pun), she said "i see that this really offended you". i had a somewhat similar occurrence with a colleague who said that fashion is for young people only and we're too old for that (for some context, fashion is my special interest). i noted her comment but didn't react because it was said at my workplace and i don't want to start anything.
my boyfriend says i should tell her how i felt uncomfortable about the card and our discussion, but i think i have already said enough at the party because i explained to her my views on ageism etc. she also noted herself i felt offended by her card, so idk what else am i supposed to write to her. btw, she's NT so she understands social cues way better than me. i, on the contrary, struggle with discerning people's intentions.
edit: it seems like some commenters don't understand why age related jokes can be insensitive. if you're about to type how it is very common and okay to tell a woman she's old after the age of 25 or 30, please educate yourself on gendered ageism and self-reflect if you don't understand how it is harmful, thank you.
another edit: for people who rush to say it was a joke, as i said above, i tried to spin it as a joke, but she was dead serious about pointing out medical facts about aging. when i said i reached the ripe age of 29, she said that after 25 we start losing muscle. she didn't go along with any of my jokes at all.