Pfizer started human testing for its vaccine May 5, 2020. The trial was done on 43,448 people - far more than the number typically used for clinical trials. The FDA issued Emergency Use Authorization for it on December 11, 2020. Thats more than six months of trials, not “only a few months”.
Did you know that in all the history of vaccines, no vaccine has resulted in a proven toxicity more than six weeks after it was administered?
Like I said before, the vaccine isn’t “experimental”. But if you’re concerned about possible effects years down the road, go ahead and don’t get vaccinated. But in the mean time, stop spreading false information about it. Also, keep in mind that we don’t know what long term effects Covid-19 might have years from now either.