I think it started when I was 12 or 13 and then lasted for maybe a year (it's hard to remember). I was untreated then. Later on from the age of 26-27 I had another bout of depression, though my therapist at the time told me she thought I had low-level depression for a long period of time prior to coming to her which seems accurate. It's hard to pinpoint the age when that period of depression started but it went on for a long time. Now I am 29 and started getting depressed again in July but I recognized it more quickly this time around so I'm getting help earlier..