And now for a ridiculous overanalysis...

The mean age of members here is 30.8, with a standard deviation of 13.4. I had to make some assumptions to get this result: I used the approximation that all people who responded to a certain category were in the center of the category (e.g. all who responded 28-30 were 29). Also, I don't know the ages of the people over 65, so I assumed they were all 65, which will lead to an underestimation of the actual average age.

This is a poor estimation, though, because the distribution is clearly bimodal, with one peak in the 20s and another in the 50s. If I treat this as two separate distributions, I get one with an age of 23.6±4.2, and another with an age of 51.4±7.8. Again, the older distribution is an underestimate, though, because I don't know the ages of the 65+ group.