Garret Baird is depressed that everyone (including himself), forgot his birthday.
Seriously, as the Sim God, I actually feel really bad about this. I even stopped the game and started over to try to give him a party, but I forgot AGAIN. If I knew that sims would get so sad about missing their birthday, I’d have planned things out better.
I suppose the only thing Garret could do is accept an invitation to go out with his cute neighbour and commiserate about getting old.