Osteoarthritis can hit anybody any age, I was 30 when I was diagnosed with it. When a break or fracture in the bone doesn't heal properly thats when it sets in. What you thought was a simple sprain could have been a fracture. Thats what happened in my case, I sprained my ankles badly years ago but they were never exrayed, now exrays show arthritis formations.
As for gout, it's an old wives tale about alcohol and rich food, I only have a couple of drinks in a month normally Shandy, and I have gout, it is an excess of Uric acid in the joins.