How to add a price discount toggle to the product/s?

Hello, total Woocommerce newbie here.

I am looking for an easy way to add an user-togglable discount option to the product, as in:

full price: X
toggle this to add a discount if you are under 30: X-10

The choice should be entirely in the hands of the buyer, no registration required.

I spent one day looking everywhere for a solution, but I couldn’t find any that i could easily implement without coding.
Can anyone please point me to some add-on/resource/tutorial for this?

Thank you!