Now I feel old. My intro to Heinlein came when my 9th-grade boyfriend gave me, for a birthday present, ten used sf paperbacks -- including The Puppet Masters -- from his personal collection, held together in a bundle with a rubber band.

As birthday gifts go, it was stellar. The only better one (by the Perfect Birthday Present definition of being completely surprised by exactly what you always wanted) was the complete works of Steeleye Span on LP, and that guy, I married.