I just turned 63 and got the Pfizer vaxx and boosters as early as I could. Honestly, I did not have any side effects at all and neither did my wife. We made a point to take some vitamins and supplements for a few days before getting the shots, but that was all.
In Dec 2021 one of our daughters, who refused to get vaxxed, came up for the holidays and tested positive about 5 days later. She was sick in bed for 5 days. My wife and I had to nurse her but we still did not get infected. Neither of us wore masks in the house during that time, but we did open windows and doors to freshen the air everyday.
She's gotten infected two more times since then, and told us not long ago she's dealing with some long haul issues.
I don't get out much but my wife deals with people from all over (we live near a tourist destination) and neither of have been sick at all since before this crud hit.
The only other thing we've really done is keep up on the vitamins and supplements. And really don't even do those everyday. More like a few times a week.
So I really can't say anything negative about the mRNA vaccine I and few other's I know got. None of us who are fully vaxxed and boosted have experienced any downside or been infected with Covid.
Don't get me wrong... I'm not feeling anything close to invincible, or smart for that matter. It's been a roll of the dice no matter what we've chose to do about covid.