There are a total of 45 signatories listed in the provided information. Here are some features of the distribution:

- Gender: 
  - Male: 19
  - Female: 26

- Age (approximate):
  - 30s: 1
  - 40s: 7
  - 50s: 9
  - 60s: 13
  - 70s: 11
  - 80s: 4

- Duration in Congress (as of 2022):
  - Since 1980s: 2
  - Since 1990s: 10
  - Since 2000s: 17
  - Since 2010s: 16
  - Since 2020s: 0 (all have served at least one full term, but less than a decade)

- Conservative Assets (as of 2018):
  - Available: 19
  - Not Available: 26

Please note that these numbers are approximate and may vary slightly based on individual circumstances or updates in available information.