Are the terms "girlfriend" or "boyfriend" limited to some age in the spoken English?
I'm asking it because the word "girlfriend" is a closed compound noun which literally (in the narrow meaning of these two components of this closed compound word) means a friend who is a young (girl). The same for "boyfriend" which means a friend who is a young (boy). Now, so far as a non native English speaker I've not noticed using of both after some young age, and if it's used in old age it may be to me a little weird. But my personal impression of it may be wrong since it's not my native language.
By checking in Cambridge dictionary I found that the definition of girlfriend is "a woman or girl who a person is having a romantic or sexual relationship with". From this definition I understand that it is not only for girls but also for women. Isn't it in the colloquial English?