Mary, known as Molly by her friends, had been talking about getting to 100 for many years.

Born at Forbes on May 20, 1916, Molly was one of eleven children.

"I'm the last one now," she said, sadly.

Molly lived in the same house in Blackheath for 50 years, before moving to Laurieton a few years ago.

Family, staff and residents at the Laurieton Lakeside Aged Care Residence gathered on Friday for a high tea to celebrate Molly's centenary.

The centrepiece was a superb sponge cake, with fresh jam and cream, made by Taste Bakehouse and donated by Amy and Aaron.

Earlier in the day Molly enjoyed a prawn and lobster lunch, courtesy of Laurieton Seafoods, and thanks to the efforts of Laurieton Lakeside staff Cassie Greentree and Donna Clayton.

"The girls (Cassie and Donna) have been absolutely marvellous," Molly said.

Asked how she felt to be 100 years old, Molly said it was no better or worse than any other day.

"You still get on with what you're doing," she said with a broad smile.

Molly's face lit up when she opened the impressively large envelopes containing official messages of congratulations from the Queen and Governor General.

"It feels very special to get a letter from the Queen," Molly said.

Molly also received a certificate of congratulations from Mayor Peter Besseling, and confirmation $100 had been donated in her name to Cancer Council NSW.

A lunch celebration at Laurieton United Services Club was planned for Saturday, with many of Molly's three children, 10 grandchildren and 21 great grandchildren expected to attend.

"Nan is showing no signs of slowing down, and considering she is now 100, she is in tremendous health," granddaughter Sophia said.

"It's an amazing milestone in her life, and in anyone's life for that matter," Sophia's husband George added.