I agree with @Damkerng's basic facts given regarding "put out to pasture" and "hardly", but I have to take issue with his final interpretation.
And at 67, Judd Hirsch has hardly reached an age when credible character actors are typically put out to pasture.
The sentence is saying "Judd Hirsch not so old that he should have to stop working."
At the time it was written, Judd Hirsch was 67 and he was considered to be a "credible character actor"--that is, not someone who would be cast in a leading role, but who could play many different types of smaller supporting roles. (For instance, he played the father of the co-star (Jeff Goldblum) in "Independence Day".)
To break the sentence down some:
In "He has hardly reached an age", as pointed out, hardly can effectively be replaced with not: so, "he has not reached an age", or "he is not old enough".
"When credible character actors" basically refers to the job that Hirsch performs; he is a credible character actor.
And again as given by Damkerng, "are typically put out to pasture" means are normally forced to retire.
So the sentence implies that there is a point where actors such as Hirsch would find themselves unable to get a part anymore, because they're too old; but Hirsch himself, being only 67, has not reached that point yet.
Now that I've read the entire article, you could approach it like this:
- the play is about people who are in their 80's.
- normally, people that old must have retired.
- Judd Hirsch is not nearly 80 yet
- Therefore, you wouldn't expect to find him looking like he's over 80, and talking about being over 80 and all that comes with it.
But, as the next sentence explains, Hirsch does some "superb acting" and plays the part of an 80-year-old very successfully.