Most recent studies show that a baby aspirin everyday can be helpful IF you've already got heart issues and are not at risk for internal bleeding. If you don't already have CVD it's probably not a good idea. Even baby aspirin has side effects.
It's actually one of the questions I asked doctors while I was trying to find my new PCP. It helped me determine how up they were on recent medical recommendations. Most said to take it. I went with the one that gave me the explanation above.
That is now the view of the doctors in the UK who all follow the N.I.C.E. Guidelines. In 2015 I was diagnosed with afib and my cardiologist in Texas told me to take aspirin as an anti clotting agent. In 2016 when I moved back to England the GP and later the cardiologist advised me to stop taking aspirin as the risk of bleeding taking aspirin was worse than the prevention of stroke, but they do recommend aspirin for other heart conditions. (And a friend here takes aspirin as he does have other heart issues)
https://www.nice.org.uk/
https://www.nice.org.uk/guidance/qs93/chapter/Quality-statement-2-Use-of-aspirin
Rationale
The risks of taking aspirin outweigh any benefits of taking it as monotherapy for stroke prevention in adults with atrial fibrillation. Healthcare professionals should be aware that adults with atrial fibrillation may need to take aspirin for other indications.