Hiya Krysi! My guild seems to have a lot of what you’re looking for: we’re mostly “older” (probably average out to the early-to-mid thirties), we aim to clear Heroic only and do M+ when folks are around, and we’re focused on having a friendly and positive environment.
We’re very small, and we do like to keep it that way so everyone can know each other. That does mean we don’t have people online doing stuff at all times, but we do use Discord actively to chat, keep up with each other, and organize groups.
Here’s our recruitment post. Please check it out and get in touch with me if you think we’d be a good fit. We’re currently looking for a healer and (preferentially) ranged dps, and we raid Mon/Thurs from 9-11 US Central time.