If you want my honest opinion... digitise them!
Do let me explain though, it's not meant as sarcasm. I've been into photography (purely as a hobby) for pushing 50 years now, and in many ways you can't beat film. There's something tangible about actually having negatives, they're a physical reality unlike a digital file which only exists as a magnetic image on a disk.
Having said that, negatives do deteriorate. I kept mine in folders, in files especially designed for the job. Over the years they did suffer, until eventually I spend months and months scanning them to digital. At least I know that now they won't get any worse, I can clean them up in (say) photoshop, and as long as I have adequate backups they're safe from further deterioration.
Obviously you can have both, keep the negatives and the scanned image(s)... keep one copy off-site just in case!
Hope that helps...
cheers