K.C.
I live in Dearborn but my daughter is just a little over 2 years old. She's very friendly though. She's also used to much older kids since she's currently the youngest in the family right now. Not for much longer though, since my younger brother is having twins in June and my younger sister is also having a baby sometime this fall. I'd be willing to go on playdates with you but it'd have to be on the weekend, since I work full-time.
Also, you might want to check out Caeserland (I think it's called that!) but it's on the corner of Cherry Hill and Wayne. It's like Little Caesers but has a HUGE indoor play area that is just right for a 3 yr old boy. My daughter loves the slide. A large pizza also only costs $7