Any particular reason or point behind this poll?
Yes. I'm 47 and was just curious to see how old everyone else is. The last time I submitted this poll, most of the people who answered were in their 20's or close to it. Also, at the time, I was the oldest. Now I'm not.
It is also a way for the shy members to get their feet wet getting involved with the forums, as long as they submit a reply along with answering the poll.
Management and/or other webmasters from x10 could use the info when designing their sites or thinking of prizes, etc.
Other than that, there is no particular reason or point to it.