I met my DH through an organisation called SPICE (Spiceuk.com).
It's been going for years and was set up, initially, by a man who moved to a new town. He knew no-one but wanted to have a go at things like abseiling or theatre trips where a larger group would get a discount. So he began advertising in his local paper, then when that got a group of people together, he started organising events (like theatre trips, then things like walking holidays). It grew and is now franchised country wide.
You join SPICE (no idea what membership fees are now), then you pay per event that appeals to you. Each group does things like meals, pub meet ups, quizzes, book clubs, wine tasting, cook a curry in an Indian restaurant, make your own chocolates (depending on the area) to more 'exotic' things like abseiling, learning to drive a tank (yes really, a day's course in driving a tank), to sports like badminton or parties at Christmas or New Year. Then they also have holidays like skiing, walking trips, they used to take over Centre Parcs for a weekend at one point (not sure if they still do that).
You can do what takes your fancy (depending on your budget). If you're on a tight budget you can also just go along to a social night - SPICE take over part of a local pub so you can meet members, buy your own drinks and that's it! I met my DH at a wine bar evening that they held.
I personally know 6 couples during our time who met and married/moved in together through SPICE and another 15 or so couples I heard of through friends throughout the organisation who got together during the couple of years DH and I were members. Two of our closest friends we met through SPICE - both now Godfathers to our DS. My SIL joined when she divorced. She learned to play golf at one event one weekend. She's now joined her local golf club - she'd never have bothered but for the fact that she had a free weekend, the SPICE golf event was nearby and she thought it'd be a laugh! So now she's out most weekends playing golf with her new mates.
The point is that, because you choose what you like, you end up with like minded people. One couple whose wedding we went to got together because they kept bumping into each other on walking weekends. They realised they were going to events hoping they'd see each other so got chatting and, 15 years later, they and their kids still enjoy walking holidays.
Lots of people go on to organise local drinks or meals involving the people they've met through SPICE and then class as friends. That's what I used to do - a little meet up of SPICE friends after work once a month. All of those friends came to our wedding and we still meet up as often as we can all these years later.
The more people you know the more chance you have of meeting someone - the woman you sit next to at, say, a dinner one evening may invite you to a BBQ where you meet Mr Right. Who knows? One thing's for certain, he's unlikely to knock on your door. And if you don't meet a man, you'll meet some lovely people and have a great time.
SPICE isn't a dating organisation - it's specifically designed for people who want to try a new event or want to make new friends or who just want to get out of a rut but don''t have anyone to do all this with.
But, as I said, if you're bumping into the same people because you like the same events you've got something in common. Which is a great place to start.
There's no age limit - one member when we were there was in her 80s (she used to enjoy the abseiling). Our friends at the time ranged from mid twenties to mid fifties.
Absolutely promise I've no association to SPICE now - I'm just a bit evangelical as I've known so many people find friends (or a bit of romance) through it. They used to do a 30 day trial for free in my day. Not sure if that's still the case but it's worth checking out.
Good luck!