I believe I recall an interview that confirmed only two out of the four non-origin companions were romanceable, which would be Halsin and Minthara. I’m not 100% on that but I’m not currently expecting a Jaheira romance.
It’s fine by me if the BG3 Jaheira isn’t interested in a new romance for character or plot reasons, but I’d rather not see posts suggesting that age should be a barrier to romance, particularly when our own characters’ ages are flexible. And certainly the menopause has bugger all to do with anything (as a nearly 50 year old woman myself, you can be sure implying that being post-menopausal means someone shouldn’t be romanceable or desirable is going to get my goat!). And I personally know a few people in their 70s who have remarried: here on Earth people both retain and form new romantic relationships at all ages.
Right, off my soapbox.