Jennifer Aniston I'm Surrounded By Spring Chickens

6/12/2013 9:00 AM PDT

Jennifer Aniston -- My $21 Million Mansion Has a Chicken Coop

And they say women lose 90% of their eggs by age 30 ... Jennifer Aniston's newly refurbished, $21 million Bel Air mansion is a grazing site for chickens.

44-year-old Aniston and her fiance Justin Theroux just completed renovations on the sprawling 3.5-acre property -- which the couple purchased last year -- and Aniston decided to maintain the chicken coop.

FYI, Bel Air is one of the most exclusive neighborhoods on the planet ... and here's a fun fact -- the house featured on "The Beverly Hillbillies" is also in Bel Air.

Who's no spring chicken now?