[rsch]

Steamboat Willie is from 1928, almost a hundred years ago. And it is still under copyright.

So you can make that “the lifetime of their grandparents” too.

[mmmpop]

I'm 35 and my grandmother was born in the late 40s, my great-grandparents.

[zdragnar]

I'm 36 and my grandfather was born in 1907. YMMV.