I think unmarried brothers who reach the age of 40 are looked at with some suspicion and sometimes with envy by other brothers in the congregation. JWs are such homophobes that some are always looking for evidence that others might not be heterosexual. There are also those that think, due to the number of unmarried women in the congregations, that its a man's duty to marry and that he's shirking that duty by remaining single. There is envy that more of his free time is his own, so they often assign more duties for the single brother to handle.
One brother that I recall from my first congregation who was unmarried seemed to be expected to be available 24/7 because he didn't have a wife and children. I seem to recall that when his father (who lived about 60 miles away) got sick, he felt the need to step down as elder in order to take care of him.
Witnesses are nothing if not judgemental and jealous of each other. The more I think back, the more I wonder what was wrong with me that I got involved with them.