"A lot of people go out on the town and celebrate with their friends. Their family has a big party somewhere," Biesendorfer said. "I thought I'm turning 40, I can do 40 random acts of kindness, maybe ask people to pay it forward."
Biesendorfer put a message out to her closest 400 friends on Facebook, asking them to donate $10 to the Bal Swan Children's Center, a pre-school in Westminster that serves kids with regular and special needs. She's on the board of directors.
The school is working towards raising $75,000 for by January.
"If I can ask my friends and family to not celebrate my birthday with me but instead give a $10 donation to Bal Swan, the cost it would cost them to buy me a martini if we went out. To me that felt right. That's what I wanted to do."
Biesendorfer started just a few days ago with a goal of $400. By Friday, she was nearing $800 in donations and adjusted her goal to $5,000.
Biesendorfer Facebook page
"People are giving more than I asked, in some cases quite a bit more. There are people giving donations who I know may not necessarily find it easy to give the ten dollars," she said.
In return, Biesendorfer has donated money to the Salvation Army, delivered home-made cards to seniors, brought home-made muffins to a new neighbor, taped a dollar to a vending machine at work and left surprise treats to co-workers.
"This is the best birthday I've ever had," she said.
9NEWS caught up with her on Friday when Biesendorfer delivered doughnuts to Fire Station 4 in Westminster and books and bird seed for a teacher at Bal Swan.
"It's really fitting with Bal Swan Children's Center and kind of our view of the world," Sunny Justice, from Bal Swan, said. "I think she's going to need help doing those acts of kindness."
Biesendorfer said it's not an age thing refusing to turn 40. It's a giving versus receiving thing, something that may come with age.
Anastasiya Bolton's Facebook page
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