laughing

My biology teacher (yes, this is the third post about her, I swear I'm fully sane)is pretty young yet she has the oldest laugh I've ever heard. I mean, you'd think that someone who is about 30-35 year old would have the typical, lively chuckle with at least full sound. Nope. When my biology teacher laughs, it really sounds like a suffocating elderly person attempting to chuckle but can't. I really don't understand.