I think that depends on the groups that exist near you.
I know someone who was in a similar situation (divorced around 50), and she found a local hiking group of divorced people who wanted exactly what you're looking for. So maybe ask on a local group on some social networks?
Hiking specifically is great because it's an activity that both kinda forces people to talk, and also supplies a default topic for conversation (It's also free, healthy and doesn't require special skills). If you're not into hiking, maybe a book club? Volunteering groups, like other people suggested, also fits that bill. Point is, don't just look for [an activity] with people your age, think about how much that activity is conductive for making friends. Something with 10% people your age, but that encourages talking with each other, might be better than something with 90% people your age where the group listens to a teacher together and then everybody does their own thing separately.
Also, It might actually get easier to find new people in a few years. Some people wait for their kids to grow up/move out before divorcing, which creates a spike of single people at that age.
The visuals were great, and the film has a hypnotic fever dream feel to it. Not sure it can be called a"good" film, but it's extremy entertaining.
The new film has more gravitas and is much more loyal to the book, but it also doesn't add anything to the book and is just less interesting to watch (for me it was down right boring). I think it over-corrected the Lynch version.