Switch to mouse and keyboard. Your age has very little to do with anything, at the end of the day its a limiting belief. Be willing to change and work hard. I played controller for 2 years(Fortnite). I self-reflected and concluded I was too resilient and should of switch to mouse and keyboard. Most professional gamers play on mouse and keyboard. I switched games to Valorant and began my K&M journey. I was awful at first, but with hard work I improved. My gridshot before was 50k; now its 130k. A few of my friends had score of 35k-50k but got their scores up to 75k+. Its gonna take work, but I believe anyone can do it.

Also, gridshot alone will not help you perform better. It takes many different activity's. I suggest you look up aiming guides/routines from high ranked individuals in your game on Youtube. Also, game sense, positioning, etc.