I think CVs do vary by sector. I work in IT. I would expect all CVs/applications to be online. No point handing a CV in in person - the HR person dealing with a particular vacancy may not be in the same country, let alone the same office. (In any case, there's no one in the office just now.)
CVs with us will be circulated electronically; HR do the first sift, and they have been talking about blind applications, though I'm not sure if they've actually implemented this yet. Black print on white background works best, because HR might edit out the personal data (name etc), and hiring managers might print the CV, though it's not encouraged.
We get 100s of applications. The first job of your CV is to get through the first sift, and it might only get a few seconds glance. It might be done electronically, looking for key words, which is why my CV says, "10 GCSEs, including English and maths," even though I wouldn't have accepted on my degree courses without English and maths GCSEs, so it should be taken for granted.
I am in a technical role, so I have a technical skills section, which is very dull, but the roles I've been for to date, if I don't list the key skills for that role, it doesn't matter how brilliant the rest of my CV is. For other roles, that won't be so relevant. The rest of my experience is scattered with buzzwords like ITIL and Agile and so on, though not entirely randomly; it does reflect my work over the years! You need to reflect words from the key skills in the job ad, because they're the words they want to jump out in a skim read. If they're there, then your CV will get a second, closer read.
What makes this difficult is there is no such thing as a perfect CV. A format which works well for one job won't cut it in another, which could be down to a different focus in the job specs or just personal preference from the hiring managers. But if you've covered basics like spellchecking and tidy format, you're at least ahead of those who didn't bother.
CV formats do differ between countries, so if you're going for a job elsewhere, you need to find out what is expected there.
I wouldn't reject someone for including their DoB, but it would make me wonder how much they knew about the Equality Act and protected characteristics, and why they think it's still relevant.