All US adults
18-24
25-34
35-44
45-54
55+
Several times a day
21
20
26
25
18
16
Once a day
21
19
21
21
22
20
4 to 6 times a week
18
18
19
20
16
19
2 to 3 times a week
19
18
18
16
21
23
Once a week
16
19
12
14
18
18
Don't know
4
5
4
4
4
4