Aspirin is pretty safe and has numerous benefits. We also have a long history of "testing" it in the real world.
However, don't forget that it's still real medicine. Don't get carried away with it. Be aware of the side effects, especially if you are taking it regularly or taking large doses.
I was taking it pretty regularly when I had some knee problems. It turned out to be a bone bruise, and I suspect the aspirin was making it worse by increasing the bleeding.
I'll also throw out my usual "broken record" warning to be very careful not to overdose on Tylenol/Acetaminophen. It can do permanent liver damage in a few days if you take a few times the recommended amount. Especially don't overdo NyQuil or take it with other drugs like Tylenol or Vicodin.
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What he said.
Look, it is very simple - in medicine more is NOT better, it is deadly. The dosages given in the literature that accompanies the package are really the maximum safe dosages that you should take unsupervised. More than that without supervision can be dangerous or even deadly, and even aspirin overdoses can cause some pretty nasty things, including kidney damage and haemorrhaging, so just keep it low and safe. At any rate, the studies done on aspirins and heart attacks showed that a low dose is just as effective as a higher dose - there is no reason to do full doses on this.
Moreover, although the effective maximum life of aspirin is around four hours, the half life is 24, and the effective protection is based on that. So two aspirins a day, morning and night is something your physician should recommend, and only if you have certain conditions and not as a general prophylaxis - dosing yourself that way may not be to your benefit. Ask your doctor, and be sure of why you want it like that. What you think may be an effective regimen may not be.
And to be a broken record - if you lose weight, exercise, eat healthily and don't smoke or drink, aspirin is superfluous, at any age, and all studies support that, too. So hi thee to a gym and get physical.