i 2nd that voteOk so the rear mudguard has rusted away but the rest of the frame doesn't look that bad. If the handlebars and seat stem move it's definitely salvageable.
Not that old, judging by the caliper-style brakes. If it was properly old, it would have rods.
I reckon it's late 50s early 60s. I'm guessing the brake cables have nipples at both ends. Reminds me of some I took off a 63 triumph. Plus the lugs are very simple but look sturdy. Can't remember which way round it was if it was plain then fish tailed or vice versa with age.
Another potential sign of age is number of spokes in the wheels. Usually older style had 32/40 front rear and then moved to 36/36. Most 70s bikes I've passed my eyes over have had 36/36 but it's not a hard and fast rule.
Last thing niggling me and I can't remember where I've seen it but by the 70s most saddles lost the eyelets for tool bags but I could be making this one up.
If your lucky there may be a date on the rear hub depending on the make. Don't reckon there will be much on anything else.
Is there any headbadge or other decals to maybe brand it with. If there is a guy on a bike on the calipers or chainring then it will be a Raleigh or one of its many subsidiaries.
Came accross this yesterday, looks pretty old or neglected, very very neglected View attachment 80823