Please can I recommend that if you have any old family photos with nothing written on to say exactly who it is, that you write down if you know or ask any relatives while you can to confirm who is on them.
We've been researching our family tree for a while now, and last night went through a box of family documents and photos. There must be a hundred photos at least and most of them with nothing to say who the people are, and when they do have a name, there's not enough information.
Sadly there's no one we can ask now as to who they might be. These photos are lovely, children's school photos, wedding photos, christenings etc but we'll probably never be able to identify any of them.