what's the problem with age?
Allot of people just have the perception that age somehow implies maturity and all the positive attributes that go along with it. But given that we're discussing pilots, that's certainly open to debate!
Plenty of pilots have had to work their way up through the lower ranks of aviation and never even got an interview before thirty and so are somewhat envious as well. The question of whether this career ladder climbing exercise really does any good toward that building of knowledge experience and proficiency is usually asked by the ones who took a shorter and more direct route to the left seat though isn't it?
So I wouldn't put too much stock in people questioning the age of a captain. It's just that most people concern themselves more with their own perspective than that of others. Way of the world...