The old man with a stick

Hesitantly approaching the Tesco busy Customer Assistant: “What date is it?”
“I think 17th”, looking at his watch, 18th, replied the shelf stocking, perhaps, Indian young man.
“Thank you”, replied the white Englishman.
Walking towards him I said: I wonder how many you’ve seen? The days.
“Ohh! I’m 91”
25 or 26? I asked. 
“26.”
Me: My grandmother is 25.
“Ohh she is doing well!” He said
Ohh you too, very well, I reassured the smiling old man.
Him: “I lost my wife 7 years ago. It was on Christmas Day.It was her birthday. We were married for 65 years, She was 86…
Where are you from?”
Me: Botswana
Him: “Ohh I was in Egypt for 2.5 years. In the army… Everybody had to enlist those days. Whoever was fit, in their eyes (half smiling)….
Ohhkay, you have a good day, nice talking to you.”