User blog comment:Shazam anthony/The flash powers/@comment-44447270-20200202225111/@comment-39769115-20200203014316

And as for Earth-90's Barry Allen, the series is set in 1990-1991. His re-emergence in Elseworlds happened in 2018. He aged at a normal speed since over two decades passed between those appearances. There's zero proof of speedsters ageing slower in the Arrowverse.