Sometimes "boyfriend" and "girlfriend" just don't sound right. I'm over 50 and in a relationship who is also over 50. I'm not a boy, and she isn't a girl. And what if one of my parents dies and the other begins a new relationship? "Boys" and "girls" over 80?
It reminds me of being in South Africa in the late 1980s (i.e. during the time of Apartheid), and a farmer I was visiting talked about the "girls" milking the cows in the morning. I had visions of 16-year-old milkmaids, when the reality was women over 40. In that case, "boys" and "girls" was used by whites to clearly put the black workers in their inferior place.