I know this is a little late, but for anyone asking the same question nowadays I decided to give an answer (: 19 is definitly not too old, infact the first year ill be able to participate in DCI is when im 19, ill be 18 when I graduate and then 19 when I start camps that fall and march the next summer. One year is better than nothing. (: sadly because my birthday isnt in a summer month I dont get that bonus year, so I can only march 3 years, make the best of it !