Age just a number for young-at-heart woman

>>> timely tonight, we wanted to introduce you to a remarkable woman who can teach us something about staying young at heart . she was born more than a century ago when teddy roosevelt was in the white house . but you might not believe it from the way she zips around. faster than a lot of folks half her age. here's nbc's kerry sanders .

>> reporter: if you think work is a four-letter word, then you haven't met dorie norak.

>> that's it. going rolling again.

>> reporter: she has been sorting and delivering the mail in hollywood, florida, for the past 38 years. a job she started when she was 67 years old. math a little rusty? let her calculate her age today.

>> 105.

>> reporter: you're 105 years old?

>> yeah.

>> reporter: you're smiling.

>> i just can't believe it myself. happy birthday

>> reporter: the day she was born --

>> february 15 , 1907 .

>> reporter: newspaper headlines reported the senate was stalling discussions on immigration bill . it was japanese immigrants back then. and as new york bustled that year, oklahoma became our nation's 46th state .

>> thank you so much. be good.

>> you're welcome.

>> reporter: do people used to tell you you're a good looking lady?

>> no, they tell me that now. you're beautiful. but i don't see it.

>> reporter: born in england, she was jewish and emigrated to the united states . a mother, grandmother, great-grandmother. she has outlived seven brothers and sister, two husbands. on rounds these days, she's a rock star . even the doctors can't explain it.

>> i'm impressed.

>> i think a lot depends on attitude. if you look at the full half of the glass and not the empty one.

>> reporter: you had cancer.

>> well, that didn't bother me.

>> reporter: she credits that laughter, her faith, cross words to keep her mind active and one other key to a long life. would you like to have a cookie? cookies. lots of cookies. kerry sanders , nbc news, hollywood, florida.