Well, it's been like 10-20 years, right? It's not a surprise to me that Colin aged.
The US version ended in 2007, apparantely.
So it's been 6 years.
But Colin is 55 years old (49 when Whose Line ended).
And Ryan is 54 years old (48 when Whose Line ended).
Wayne is only 40 years old (34 when Whose Line ended).
I wasn't surprised they look older, because they are older.
But they have aged quite visibly. Just came as a shock.
They don't look bad though. Just grey-haired and slightly more wrinkled.