Its not about how old the candidate is, its about not having other valid alternatives when you dont like the candidate chosen for you.
Edit: just to make sure the point gets across. Imagine going to a restaurant, the waiter asks if you want to drink moldy water or toxic industrial waste. You see behind him lies an array of normal, refreshing beverages but sorry, you weren’t given those choices so you can’t have any of that. Thats basically this election.