I'd say mid 60s from the clothes they are wearing - being pretty much what I was wearing myself at that time. I was living in North Yorkshire then so I have no idea if the queen visited here or not.
I do remember her visiting the area in about 1954, part of the "Coronation Progress" where she and Philip covered most of the country. The motorcade went down Blackburn Rd. in West End, past our house. It was lunchtime and our next-door neighbours' son was home from Howard & Bulloughs for his dinner. The old man, his dad who they still called Yank, who had bummed and worked across America for 20 years at the turn of the 20th century and came back with the Canadian Marines in WW1, stood like a ramrod as the queen went past and gave her the smartest salute you ever saw. Tom the son, local cricket hero, stood with his hands in the pockets of his boiler-suit and gave her a nod and a cheerful wink.
