I worked there in ~86/87. And yeah, it was any meal free on your birthday.
I was there for about a year while in HS.
During the summer I worked the 11pm to 7am shift (which wasn't legal because I was under 18).
Good times!!!
And I did pretty well with the waitresses...
I also ate well! The cooks and I became buddies, and they would cook a "mistake" for me.
I remember having a Chicken dinner, a Steak &shrimp, and a breakfast all in one night.
Not exactly like eating at Morton's or Ruth Crist, but pretty good to a teenage guy making $4 an hr.
I was 17, and very athletic, and involved in playing in a rock band.
Today, that would be enough food to get me through 3-4 days.