Does the PDGA list the age of individual golfers anywhere? That information would be helpful for individuals to get an idea of who might be competing in their age restricted division from year to year. If not, has this idea ever been considered?

It's one of several sorting options for stats on the web that hasn't risen to the top of the priority list for our web volunteers. However, I believe one way to find out this information is to contact the TD of a 2005 event in your area. They receive a PDGA member list that probably indicates who qualifies by age and rating in different divisions.

Altough it's not a complete list of PDGA members, you can look on the invite list from World's. The birth years of those who were invited are on it.