Can I delete years worth of email without clicking on each one?

Hi Liliana2601,

Welcome to the Apple Community, where some of us do our best to help each other.

Apple have an article in the online iPad User Guide that says you can delete multiple emails., and explains "how to"

Delete and recover emails in Mail on iPad:

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https://support.apple.com/en-au/guide/ipad/ipad0bf80ff4/13.0/ipados/13.0

The iPad User Guide is handy to have access to, and can be found via the link below:

(After clicking the link : You might want to click on "Table of Contents" to see all the topics you can find out about.

You may want to "choose" your iOS at the tops of some pages, to see the correct info for your iPad.)

https://support.apple.com/en-au/guide/ipad/welcome/ipados

Cheers :)