They looked older back then ....
They always looked so much older than their years back then!
I've just watched Jack Hawkins in The Long Arm (1956). He was 46 years old when he made that film, but he looks more like he's about 60 years old. I'm knocking past 60, and I look 20 years younger than Jack Hawkins aged 46 in that film!
A fine British actor btw. RIP Jack.