Since humans are biological similar to viltrimites like Nolan says, which is why they mate with them then why don’t they have any kind of technology to make their lives longer. It’s stated that they live for thousands of years and are centuries past earth in terms of technology. So why isn’t there something that can make humans live longer or something ? I just don’t get it. So that way Nolan wouldn’t have to worry about outliving Debbie and he can spend much more time with her.