You got 40+ years out a garage door opener? Mercy! That's about 3x times the average. If you are in USA, Sears does makes a decent garage door opener.
Garage-door openers are now safer, quieter and in some cases, faster. All models have an automatic reverse if there's an obstruction in the path, and some have outside keypads for entry.
FWIW, I would still try cleaning and/or lubing the chain and the garage track and seeing if there's anything blocking the pathway. Be aware that old motor will not do so well in the cold. After 40+ years, it might even be the remote itself isn't working reliably as they wear out, too. I doubt that it is ONLY that as the cause because you occasionally have trouble lifting even from the button inside.
Try clicking on the link to http://www.sears.com.
A good place to read user reviews, Especially of Chamberlain.
Craftsman garage-door openers (made by Chamberlain for Sears). Craftsman 53990 3/4-horsepower chain drive, the Craftsman 53910 chain drive and the Craftsman 53985 chain drive. The pricier models tend to get more rave reviews by the users/owners, particularly the more expensive belt-driven Sears Chamberlane model.
Hard to tell about the lesser-priced models operation in cold weather with how sporadic the reviewers comments are here.
Try to find a brand of garage door-opener called "Sensible Home", and/or a model called "Genie", or Genie Excelerator perhaps. Home Depot sells these.