All US adults
18-24
25-34
35-44
45-54
55+
Several times a day
14
7
14
18
13
14
Once a day
15
12
16
14
16
15
4 to 6 times a week
18
23
21
18
16
15
2 to 3 times a week
22
26
19
18
23
24
Once a week
24
21
23
26
26
25
Don't know
7
10
7
7
6
7