Old looking actors who were not as old as you thought.

kenny cd pass for 80 no prob

in a certain light

Ben Button

Wilson was only 53-54 when 'one foot in the grave' started, where he came across as 60+.
Oddly enough, 26 years after the first episode - the three main 'elderly' cast members(Mr. & Mrs Meldrew and Mrs Warboys) are all still alive.

Stephanie Cole was 49 when she first played an old lady in a retirement home in Waiting for God.

Tony Hancock was 32 when Hancock's Half Hour started on TV, by 1960 at 36 he looks pushing 50.

Felicity Montague was 37 when she first played Lynn in "I'm Alan Partridge".  Obviously Clive Dunn is the old looking actor's old looking actor.

Stephanie Cole was actually 48 when Waiting for God started, fk me that IS Clive Dunnesque.

William Hartnell was 55 when Dr Who started, well he looks 75 to me

Clive Dunn in Dad's Army (nap)

Alf Garnett and  Blakey

Old man Steptoe

.
http://www.dailymail.co.uk/news/article-2219401/Steptoe-Sons-Wilfrid-Brambell-latest-BBC-star-accused-child-sex-abuse.html

I think jamie vardy could play a young steptoe is required

Eli Wallach in The Holiday.

George Roper ( Brian Murphy)

How old was he when he was in Man About The House and George And Mildred?

Not quite an actor but I'm still shocked Jim Bowen is only 78.