42 isn't that old. Small injuries creep up and stick around for longer, and warming up and doing proper stretching and drills is VERY important, but I think a person (if in decent shape) can still run fast through their 40s. A lot of people lose interest or enthusiasm when training gets more difficult and personal bests seem out of reach, but I think most people could still come within an arm's reach of their best times if they focused on working hard rather than thinking about what they can't do or what they wish they could still do. It just takes a good attitude. And maybe some extra work in the weight room.
I spent several years during my mid 30s being all depressed about my loss of identity as a fast runner. It was pathetic though. I was too concerned about others' expectations, and living up to a past version of myself. If I would've had a healthier attitude, like being more concerned about doing the best I could at that moment, I wouldn't have wasted some of the fast years of my life. I was still running personal bests in the 800 at 32-34 years old, but as soon as it got a little more difficult and required some changes to my training I kind of gave up on myself. Looking back now, it was a big mistake in attitude, and I wish I could've seen things more clearly.
Now that I've gotten over my self pity or loss of identity or reluctance to adapt or whatever the hell it was, I'm running fairly well again. And I'm actually enjoying it. It's been years since I actually looked forward to working my ass off on the track and in the gym. I'm 40 now and plan on breaking 50 seconds in the 400 and 2 minutes in the 800. Not fast in the real running world, and not close to what I ran when I was younger, but who cares? They're just my personal goals. If you want to break 70 seconds, then go do it. Don't worry about what people on here think is fast. If it's fast for you personally and you can work to achieve it, then you've done more than most people. Of the people I know in their 40s, most of them have absolutely no goals of their own. They watch other people achieve goals on television - people they don't even know - and they live vicariously through them. And they feel proud as if they actually share in the accomplishment! It's such a pathetic version of sports participation it kinda makes me mad when I really think about it.
Anyway, this went way too deep, but congrats on actually playing soccer rather than just watching, and I hope you work at getting faster. That's the best thing about this sport. The chasing of personal potential.