Fiter in link

Hi! Last things to be done, we do love this filter!

animalinneed.site/honden

What I would like to achieve: Dogs have a year of birth. Now I want to link to the youngest ones. So I can slide to birth between 2019 and 2020 and I have all the pups.

If I use form method get I can use that link for a button 'pups' it would only be valid for a year. So I need to create a link that sets the slider at year of birth to highest and to highest -1.

(also a link for -2 till -4 (young dogs), a link for -5 - 10 (adult dogs) and -11 till the highest number available (senior dogs)).

I can imagine this being hard to create, but it would be so great for the site and its features, so I really hope you can help me.

Best regards,

Remco