Almost invariably, X is younger than I am now, often younger than I was when I started doing literally every single one of the things that are now my greatest passions in life. I always want to encourage anyone who has a thought like this to ignore it and just do the thing. There is time. If you are nearly 30, or 40, or 50, or even 60 or 70, you will have years to expore and enjoy whatever you choose to take up.
Every hobby and interest and skill that I am passionate about is something that I started "too late." I learned my first word of a foreign language as an adult, much too late to easily acquire a foreign language. I got hooked, though, ended up fluent in two foreign languages, and have spent almost my entire life since that point living abroad.
I've played RTS since Command & Conquer came out, but had no understanding of the strategy and didn't even know there was a StarCraft scene until I discoverd TL when the SC2 beta came out, when I was already 28. I debuted in Bronze when the game released, and made Master League for the first time two years later, studying Day9 Dailies and practicing while my newborn daughter napped during my paternity leave. After a long hiatus, I got back into the game a couple of years ago, and at nearly 40, with kids and a mortage and a job and all the stuff that we all have as grown ups, I'm making another run at Master League.
I have always wished I could make music, but I always figured it was just too late; I took piano lessons as a kid, but never really practiced and so I couldn't play anything. And I loved to sing, but I couldn't hit a note to save my life, and my voice sounded... well, like a dude with no idea how to sing. Then David Bowie died in January of 2016, and something about his life sparked something in me. I was 34 that year, awfully old to start learning, but I signed up for singing lessons that week, joined a local choir a few months later, and started performing in local musicals a year after that. I started taking piano lessons, too. Now my days are full of music - Bach and Mendelssohn and Mozart and Queen and the Beatles and old American folk songs. And two days ago - three months before my 40th birthday - I joined my first band!
I'm obviously very pleased with myself - I'm proud of pulling off this shit. It's not easy to be a grown up and be responsible to your children and your spouse and your employer and still find the time to invest in yourself and the things you care about. But I'm not sharing this from a need to toot my own horn; I really just want to put the idea out there that "I'm too old" is almost never a good reason not to do a thing. I started doing almost everything I care about when I was "too old," and my life is exponentially richer because I did.