The table below gives the number of United States presidents from 1789 to 2015 whose age at the time they first took office is within the interval listed.

Ages	Number
40-44	2
45-49	7
55-59	11
60-64	7
65-69	3

Of those presidents who were less than 60 years old when they first took office, what fraction were at least 45 years old?