Major League Baseball attracts more interest from older age groups. A list of people by age who said they were "very" or "somewhat" interested in a given sport, according to Nielsen Scarborough research.
MLB
18-20: 23 percent
21-34: 25 percent
35-49: 28 percent
50-69: 32 percent
NFL
18-20: 37 percent
21-34: 41 percent
35-49: 44 percent
50-69: 46 percent
NBA
18-20: 21 percent
21-34: 22 percent
35-49: 21 percent
50-69: 18 percent
NHL
18-20: 15 percent
21-34: 15 percent
35-49: 14 percent
50-69: 13 percent
CHRIS HINE