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It depends on your level of conditioning, how much you train, and your training history. I wouldn't push trying to get your time up too quickly, especially at your age. Just take it easy and do the best you can to improve your speed. Do a very gradual speed program. If you have access to a 'mill, you can use it for speed training as well, it will be a littleLittle noses decongestant Little tummys easier on your joints and feet. I do all of my HIIT workouts on a treadmill but do my long runs outside. FWIW, I'm in my late 40s and my 5K time is about 25:00. But I run about 50-65 miles a week and do marathon training on a semi-regular basis. And I've been running for years. But speed work to run shorter races isn't a priority for me.
Another way to get faster at shorter distances is to increase your mileage, a la Lydiard. If you can work up to 60 or 70 miles a week, or have the desire to do it, you'll start smoking at 5K and 10K races.
Check out coolrunning or the Runner's World websites for more info.