There’s actually a club for people who have tasted more than one hundred grape varieties: the Wine Century Club. To become member you have to have tasted at least 100 varieties. And if you have been seriously bit by the wine bug (the wine louse?) you can even become double, triple, or quadruple member. The club organises wine tastings to help prospective members reach the magical numbers (and to entertain current members one assumes).
Perhaps time to start a local chapter? On the site you can find a chart in the membership application document where you can start ticking off varieties to help you to get going! A quick count over lunch reached 140 for us. More info https://www.winecentury.com
So, now it’s time to start counting! How many grape varieties have you tasted? Probably more than you think!