Well after 22 years the armrest door in my Maxima split. Any ideas how to fix

 

I have the same problem with the sides of my front seats. I used this product to mend it:
J-B Weld 2130 Vinyl and Leather Repair Kit, 2 fl. oz
https://a.co/d/7H6c3kj

 

Thanks I'll give it a try.

 

I had a similar problem. My cat decided to attack the passenger side door and caused huge scrapes. Similar damage. We had a local "vinyl doctor" (interior repair service) fix it. It was about $100 and they offered mobile service. Looks like new. You might have a similar service locally.