The table below gives the number of United States senators from 1950 to 2020 whose age at the time they were elected is within the interval listed.
| Ages | Number |
|---|---|
| 35-39 | 4 |
| 40-44 | 10 |
| 45-49 | 12 |
| 50-54 | 8 |
| 55-59 | 9 |
| 60-64 | 5 |
Of those senators who were at least 45 years old when they were elected, what fraction were at least 60 years old?
