How to have an entity keep the name tag name when aged up?

When my entity ages up it no longer keeps the name tag name it has been given, ive tried coding it myself however it doesnt seem to work, if anyone has any suggestions please let me know, this is the coding i have attempted but didnt work = 

I am new to trying to code as i have a lot of spare time now so if anyone can give me some tips please feel free to !