At 90, She’s the Toast of the Town : Entertainment: A year after launching her new career, Irmsie Brown is one of the oldest working character actresses in Hollywood, with roles in film and TV.

Irmsie Brown may be a neophyte actress, but she’s still got a few rules about Hollywood conduct she simply refuses to break.

For one, she absolutely will not pose in the nude. She won’t jump into bed with any smooth-talking Lothario on the set no matter what size the paycheck. And as for those lingering, full-body-contact kisses?

Forget about it.

That’s because the 90-year-old Van Nuys widow has this image of the silver screen back in its more innocent infancy when she was a kid sitting in a darkened theater with a box of popcorn--days when such matters as sex and nudity were, well, just left to the imagination.

“Things just don’t have to go that far, people dropping their clothes at the drop of a hat,” she said. “People in this town just have to learn to keep their pants on, that’s what I think.”

Brown knows she has a few things to learn about The Biz. And fast.

Last year, at the unheard-of age of 89, the former Wisconsin housewife and bookkeeper for her son-in-law’s Toluca Lake talent agency plunged into a new role that has casting directors’ heads turning: She hit the big screen, becoming one of the oldest working character actresses in Hollywood.

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A sprightly, gray-haired woman with slate blue eyes and an unassuming style, Brown recently had a bit part in “City Slickers II” with Billy Crystal, playing an elderly Central Park jogger who is nonplussed as Crystal’s character takes his pet cow on its daily run.

On the CBS television series “Hearts Afire,” she has portrayed an elderly party-crasher--an interloper who hits a buffet table on the sly, stuffing brie into her purse.

And she has become the resident old lady on the “Tonight Show.” In one recent skit, Brown played a bespectacled, shawl-wearing grandmother who trades in her handgun for a pair of “Tonight Show” tickets. In a second, she was an elderly Woodstock veteran, an aged ex-hippie named Sunshine who, dressed in a bandanna, beads and a tie-dyed ensemble, fashions a bong out of an old Metamucil bottle.

On the set, Brown has already developed a reputation as an able actress fit enough to repeatedly run up and down a hill in a jogging suit until the scene is right, casting directors say. And, even at 90, she has another ability that eludes some actresses half her age: She remembers her lines.

“What casting directors like about Irmsie is that she really is old--she’s in the same ballpark as George Burns--so she doesn’t have to act the part,” said Candace Potter, an agent at the Tyler Kjar Agency, the family-run business for which Brown still keeps the books.

“And while Irmsie may be old, she’s in great shape. She can still talk. She has the faculties to remember her lines. That’s why the phone keeps ringing.”

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Fran Bascom, casting director for “Hearts Afire,” said Brown has a style of her own. Bascom recalled a recent shoot where the actress rejected a wardrobe room full of shoes and wore her own pair.

“Irmsie had these orange high heels,” Bascom said. “Most experienced actresses would never have worn those shoes on the set, but she wanted them. At her age, you at least would have thought she would have worn flat heels.”

Bascom said Brown’s advanced age is an asset--even in an industry in which youth is prized. “Irmsie’s secret is that she really does not look her age. But when the call comes for someone really, really old, she’s the real thing. I wouldn’t be surprised if she was the oldest working character actress in Hollywood.”

Born in Milwaukee in 1904, Brown married Sheldon Mehlos, who preferred that she become a mother and housekeeper rather than pursue a career. Brown worked temporary office jobs but kept her own conservative values.

“If women go to work, I think they should respect their bosses,” she said. “They have to remember, the workplace is not the same as leaning over the fence with all that gossip. You can’t take back what you say. So it’s good to watch what comes out of your mouth.”

Back in the 1920s, such conventional ideas cut short a would-be entertainment career before it got started.

Brown was hired as a dancer in a Milwaukee vaudeville act.

But walking up the steps to the hall, Brown suddenly turned to her husband and said: “Oh Shelly, we’ve only been married two weeks! I can’t do this. I can’t leave you now for all those practices and performances. I have to try marriage before I can do something like this.”

The couple moved to Los Angeles in 1970 and Brown took a bookkeeping job in her son-in-law’s firm. Especially after Sheldon’s death in 1985, following 60 years of marriage, Brown became a known commodity to about 400 actors and other professionals represented by the agency--developing a reputation for the small inspirational lines she would write to clients on the note space of their checks.

“I just thought that was really cool the way she encouraged people, especially in a town where encouragement comes in small doses,” said actor S.A. Griffin. “She writes things like ‘We love you, Stevie. Keep it up’ and ‘His love keeps us alive.’ It was just so unique.”

Griffin recently gave Brown a small obelisk to honor her acting efforts, calling it the Irmsie Award. She keeps it at the office, close to her side, right next to the urn that contains Sheldon’s ashes.

Last weekend, friends, family and clients threw a 90th birthday party for Brown, celebrating her bookkeeping and acting careers as well as a spirit that continues to win friends.

Throughout her 80s, Brown lived the life of most octogenarians: She tried to keep active, sadly watching many of her friends die. Then her life took a plot twist.

Her grandson, Brandon Kjar, an agent at the talent agency, entered her picture in the Academy of Motion Picture Arts and Sciences Players Directory, the classified pages for actors looking for work.

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Then the casting calls started. But Brown stuck to her conventional guns concerning what roles she would take. She shied away from a pizza commercial when the role called for her to lie on an old couch with a man in a seedy motel.

Recalled son-in-law Tyler Kjar: “She informed me there were some things she would not do.”

Then came the “City Slickers II” role. “We told her she had one line in the film,” recalled Kjar. “She thought for a moment and said, ‘How long is it?’ ”

Ironically, Brown got the job for nearly dropping her pants during the casting call.

“They made me run up and down a hill in my sweat pants,” she recalled. “Well, I hadn’t hitched them up properly and suddenly I looked down and thought, ‘Oh my Lord, my britches are falling off!’ ”

The studio loved the moment. And for Irmsie Brown, the rest is Hollywood history.