The aliens take over the bodies of an elderly couple who died in an auto accident (I think). I haven't seen this movie since I was 12, so 40 years has dulled my memory a bit. Still, I keep wishing I knew the title of this movie! Thanks for any help!

The older version of, "Invasion of the Body Snatchers".

I will check that movie out, but I remember seeing it years ago and I don't recall there only being two aliens and that the aliens manifested themselves as floating balls of light.

Thank you for responding. I will continue to search also. Blessings

Strange Invaders (1983) (http://www.imdb.com/title/tt0086374/) I almost can guarantee it is this one...

I thank you both, but the movie I am looking for was Black & White and I saw it as a kid (I'm 52... wish I had been a kid in 1983 -lol!) I do remember that some of the action took place in a cave and that the two aliens had names when they talked to each other, and were very disappointed when they were foiled at the end and zipped away. Definitely a B movie!

Sounds like The Cape Canaveral Monsters (1960) (http://www.jabootu.com/acolytes/bnotes/ccmonsters.htm)