Okay so people are not really answering your full question.
5-20 lots of folks, easy to find groups. After 20 it gets really tough, sometimes there is a group or MAYBE 2 in LOIO if you're lucky.
MM can sometimes have a group going but people power level/solo there a lot and it can be very inconsistent.
I have multiple 20+ toons but none are over 40 because I usually get frustrated because the population 25-35 that are willing to group is just not very good.
Also people will usually quit groups quickly if there aren't multiple twinks with very fast pulls and efficient killing.
Not to be a doomsayer but people leveling twinks are very impatient these days when it comes to group efficiency. Which is an issue because there isn't very many groups to start with.
Hope I didn't burst your bubble
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