I still get the occasional zoo trip for a present as well, and I'm about the same age as you...It won't be my actual first 2021 visit, as I went to Twycross on the first weekend of the year, but I'm booked in with my parents to visit YWP on the 18th April if all runs to plan (they're taking me to the zoo for my birthday - it's like being 12 again).
Don't worry, you're not alone!