hall. both of them serve as school principals in baltimore before retiring. investigators are trying to determine what sparked the flame at their home. >> the baby boomer senior expos one-stop shopping. >> the expo is held at the timonium fairgrounds and this year features over 250 exhibitors. rob roblin has the story. >> this is the 24th annual baby boomers senior expo, and every year it just keeps getting bigger and bigger. an hour after the opening this morning, the place was packed, as seniors from throughout the area came to one of the largest events of its kind. >> this the 24th annual year for this event. we are proud to have expanded to this capacity this year. >> everything from home safety, how to eat better, take better care of yourself, how to stay independent and in your own home. >> this is a place to get information. some were here to find out how to get health insurance. >> i am looking to change by medicare plan this year. the one i am in is not one that is going to make me happy. >> they can sit down and take all the time they need and have someone go through all the different options. >> for others, a chance to get some medical tests done for fr