Hi there! It sounds like our guild may fit that description.
We have been around since 2007 and adhere to the ethos of inclusivity, not exclusivity.
Our core membership is in the, erm, “mid” age range, with many people having families, job and other responsibilities and just want to relax and have fun after one of those days 
A lot of us are from the UK, but we also have a lot of members from other parts of the EU.
We raid twice a week, Wednesday and Friday, each for 2.5 hours. Wednesday we start raids at 21:00 server time, Friday we start at 21:30 server time.
Our raids are casual and social. There is no attendance requirement (ie, there’s no requirement for anyone to sign up to a specific number of raids), we don’t expect people to stick to a “main” character when raiding and anyone in the guild can sign up to any raid they wish to attend, as long as they fulfil gear requirements.
In the majority of instances, there is no experience required (we’re currently having a play with the last boss in Heroic, so we’re temporarily changing that a little for this one!).
Quite a few of our members have chronic altitus so there’s usually someone around levelling an alt 
We also have members who are interested in achievements, pet and mount collecting, transmogs and just completing everything they can.
For dungeons … we have a “Mythic Monday” weekly where anyone can join to learn M+ tactics and routes, and we also have plenty of people that run M+ from low level casual runs to pushing to time 15+ keys.
If you’re interested, you’re welcome to join our discord https://discord.gg/gQ2uBGe to find out more about us, ask questions and perhaps join in the occasional M+ 
We do accept new members by application only on our website - this helps us try to ensure that we are the type of guild people are looking for, and they’re the type of people we’re looking for 
You can find our guild rules, ethos and information, along with the application form, here: https://www.darkwolves.eu