"There's always a way to make a family, and that's just what I did," the New York City-based publicist tells PEOPLE

By Sheila Cosgrove Baylis and Alexandra Zaslow
Updated February 27, 2015 10:45 AM
Credit: Courtesy Tracey Kahn

Tracey Kahn has created a happy little family with the help of modern science.

The single mom and career woman, 51, delivered her second daughter on Feb. 18 and is thrilled to welcome her into their family.

“I’m the happiest I’ve ever been,” Kahn, a successful publicist in New York City, tells PEOPLE. “I get responses like, ‘OMG you’re so old, why would you do that?’ I tell them that I’m in good health and just decided to fulfill my dream of having kids, whether I was married or not. It’s all about how you raise them.”

Kahn’s newborn daughter, Eloise Becket, joins 2-year-old Scarlett, and while both girls are the products of anonymous sperm and egg donors, they are full biological sisters.

Kahn used the same donors and both were conceived via in vitro fertilization, but Eloise was conceived at Reproductive Medicine Associates of New York and Scarlett at Weill Cornell. Kahn had Scarlett when she was 49, and when she went back to Weill Cornell Medical Center to conceive again, she was too old to enroll in their program. But Kahn says Reproductive Medicine Associates has many clients in their 50s.

“I met some moms over 50 at the clinic, believe it or not,” Kahn says. “I didn’t stay close with them, though. Their situation is different because they were all married.”

Even though the donors are anonymous, Kahn still got to find out a little about them, like the sperm donor’s SAT score and that he likes to travel. She also saw photos of them as children.

She wanted to have kids earlier, but time just slipped by.

“I still have bad days where I wake up and realize I’m going to be 80 when she’s 29, but I try not to worry too much about it,” Kahn says.

She says she is happy with her lifestyle but hasn’t given up on finding a man.

“Don’t ever say you can’t have kids,” Kahn says. “If I’ve learned anything from this, it’s that there’s always a way to make a family, and that’s just what I did.”