Should I delete old files on an SSD?

[docgerrard]

I hear since there are only a limited number of writes or something, constantly deleting files is not good for your hard drive. For example, I may download documents and some large PDFs from the internet. I don't need them when I am done. Is it completely safe to delete them? I have the 2011 MBA

 

[TheRealDamager]

Yes - feel free. The "limited life" issue with SSD's is pretty overblown.