If they ran 3 years of 50-75 miles per week in high school and ran a 16 min 5k, but were then sedintary for 8 years
If they ran 3 years of 50-75 miles per week in high school and ran a 16 min 5k, but were then sedintary for 8 years
If not overweight, one year. Six months to build up mileage, six months to regain speed and get a feel for race pace. Most people are faster in their mid/late 20s than in high school if properly trained.
I would say one year is optimistic and assumes no injury setbacks and 100% commitment. Preferably no kids or partner and an easy job or no job. Otherwise 18-24 months. This is to get in top shape, not just good shape.
Washed up. Interesting question. A professor at my university approached me and asked if he could try to get back to what he ran in high school. I coached him along with my team and it did take about one year for him to shed his middle age body and get fit. I was a wonderful experience as he worked hard and really wanted to achieve his goal. The prof had a family, full time job, etc but made it. I think he wrote a book about his experience. But it can be done but isn't without pitfalls mostly injury. Good luck.
Really depends on how fat you got and how long it takes to lose that weight.
Once you drop some weight, I'd say you will be back to running well very quickly. You are still so very young.
Agree w/consensus here (18-24 months)
You are still in your prime. Alternatively, get back in shape and don't worry about prior PRs, live a balanced life of fitness actit and fun--this is a good option too. So what if the 5k is 19 and change now but you lift and chicks ogle you and now you're a climber or whatever