25, and a repeat offender of the "over-share", so sorry about the editing job ahead of you, Dani :P
I've been over the 100kg mark since childhood. I couldn't tell you when that first happened, but I remember going to the Royal Adelaide Show as a kid, the one time big rides come to town in little Adelaide, and wanting to go on one of those roller coasters. You know, the ones with the safety harness that shuts over you and locks in for safety? I was too big for it to close. The ride manager came over and tried to help, closing it with a little force, but it just wouldn't shut & I had to get off and wait for my sister. I would have been 12 or 13 at that point.
The last time I weighed myself (before last year) was when I went to a kickboxing gym with a girlfriend and we had to weigh in before training. The club was owned by her dad who had suggested we come and play for the night. I stepped on the scales, at this point I was 15, and weighed in just under 120kg. I remember my small Cambodian girlfriend looking at the number and saying something along the lines of "wow Sarah you're SOOOO heavy" in an innocent reaction with no harm intended... I avoided the scales for almost a decade after that. (out of sight, out of mind)
When I left Uni (the first time) I went to work in a call centre, expecting to be there as an "in-between" and ended up working my way up into a comfortable management position and staying for about 6 years. I learned all kinds of new & creative ways of avoiding movement whilst in that environment, wheeling my way around the office on my chair instead of walking, printing out a report at 10am but not picking it up until I had to walk passed the printer for that lunch time meeting, or catching the elevator between a single flight of stairs.
Fast forward to February 2012 and I was standing on the scales in a doctor's office being told that I was 165kg and at serious risk of a heart attack. I'd gone in initially to have him sign a medical waiver for me to do an event with some friends, he took one look at me and said no. The next thing I know I'm having blood tests for obesity related illness, being sent to hospital for an ECG to check my heart and being told I shouldn't be doing anything more than light cardio until I get a little of the weight off.
I bought a bike, I started hiking with friends on the weekends, and joined a circuit gym where I could train with professional guidance. I spent one night a week with a "foodie" friend who taught me how to cook one new healthy meal each week, and I would go home and prepare that in bulk for freezer meals for the week ahead. 12 months later I was no longer scared of the kitchen, training in ways that felt more like playing than training (crossfit, rugby, boxing, cycling, hiking, trail running),and, a pretty amazing bi product of this new life, I was 70kg lighter.
The short version is that I trained 6 days a week & prepared every meal I ate for 12 months. I trained weights (crossfit) in my lunch break and cycled 30km home from work most nights. The physical "what did you do" is just so much less significant than the mental empowerment this process brings about though - and that is your own to find.