What age do you consider young and old?

At my work there's a wide range of ages from 23 to 62. They call the 30-year old's kids, the 20's are babies, the 40's are "getting up there," the 50's are over the hill and 60+ are older than dirt.

When I think of someone being older, I think of someone about 15 years older than me.

Kids are anyone under the age of 30.

Children are 12 and younger though I've called 17 year olds children and watched them shudder.

Really old is someone 30 yrs older than me.

How about you?

What age do you consider old?

Older?

Really old?

Young?

a "baby?"