"I have lived in the only decades I could have lived in, and hope to live through at least a few more"

Orson Scott Card is expressing his gratitude for the time period in which he has lived while also communicating a sense of optimism for the future. He acknowledges that he has actually just been able to exist within a particular window of time, however rather than regreting this fact, he selects to welcome it. Furthermore, by specifying his desire to live through a "few more" decades, he recommends that he sees worth in the years to come and anticipates experiencing all that they have to provide. Ultimately, Card's words reflect a sense of satisfaction with the past and an enthusiastic outlook for the future.