Thanks for this. From your reply, the issue of ''qualifying age'' seems indeterminate, and I agree.
I asked for 2 reasons, namely: the word ''heritage'' has begun to be as inappropriately used as ''iconic''.....which will eventually go the way of ''gay'' and lose it's original meaning. Also, I've some old photos given to or bought by me, just a few actually taken by me, which could be termed as having ''significance''. The oldest are from Berlin, e.g. our tanks at Brandenburg Gate before the Wall went up, various ''liberation of Biafra'' photos, and some less than a year old. I'll never have several scanned or otherwise copied, and will never post any.