Based on the age and tenure graphs, it seems a lot of representatives in their 50s were voted in during the 90s, and relatively few of those have been replaced.

Based on the age and tenure graphs, it seems a lot of representatives in their 50s were voted in during the 90s, and relatively few of those have been replaced. This would be the Baby Boomers coming in to their full political strength. However, there seems to be a similar wave of fresh-faced, long-sitting senators coming in the early 80s, and I'm not sure what generation that would map to. The "Greatest Generation", perhaps?