re: What is a decent time for a 5k?

should have said if you are doing one in the summer early morning is best (was thinking of today when I wrote that)

Overall I'd think fall or spring is best obviously

The optimal temperature to run a marathon is in the 40's.

So, id imagine a 5k temperature would be in this same ballpark. No doubt 85 degrees and 85% humidity at 8 AM wouldn't be optimal.

Running a 25:25 5K after 3 months of training is pretty good. I was running around 28:00 at that point. It took another 3 months to get under 25:00. After another 6 months of training hard I was just under 20:00 and had dropped 40 pounds. I miss those days, the knees don't let me do it any more.

Agreed.

The hotter is, the slower I am.

If it's cool, I can get all the way down to sub-9:00 miles.

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Any tips to increase endurance other than just keep running?

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like others have said, sprints, hills, etc...I mix in some bleachers at one of the locale HS stadiums when I can.

once or twice a week i run a 2 mile as fast as I can.

As much as I hate it I think I am going to start sprinkling in some tabata/interval work.

Did you walk the whole way?

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Just focus on improvement, enjoying it (running with a friend to talk with makes all the difference, and staying on soft surfaces as much as possible. You will continue to improve over time even at your age.

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I mean, this. Really, if running is a chore, you wont enjoy it and develop good habits.

I'm by no means the fastest person, I'm a slow and steady kind of guy. I ran my first sub 30 5K last year, missed breaking an hour in the Crescent City Classic this year by a bad choice in starting groups. Ran my first half marathon last year, which my time was nothing special in, but I finished it under my goal.

I worry about setting goals for myself and working towards them. Each goal gets progressively more challenging, but it keeps me motivated.

I never understood the hate for people trying to get in shape or better themselves. Thats more than the vast majority of Americans sitting on their asses are doing. A little encouragement goes a long way. The cycling group I used to ride in was pretty big, with some pretty badass riders in it. Group would start off together and slowly work their way into pace groups. As someone on my entry level Trek road bike making my way to the front of the peloton, it can be really intimidating pulling guys that at any time could smoke your best pace with little effort. First time I did it I was scared I was embarrassing myself and people would be mad at me for setting the pace too slow. As a pulled off and drifted through the back, just about everyone told me "good job/great pull". As I said, a little encouragement goes a long way.

A decent time is a time and pace that works for you and your body. The absolute worst thing that you can do as a beginning runner is to push yourself too hard in order achieve some random time. Your number 1 goal should be avoiding injury. Nothing cuts down on your training time and advancement like shin splints or plantar fasciitis, or something that pulls or tears...
Patience, grasshopper...