You can always start at any age, but my best tip was always start as soon as you can. pewdiepie did an extensive video on how he learned to draw just by heavily using references, anybody can reach a professional level with art, and he reached an amazing skill in just 100 days!!!
Digital can be easier to learn since you won't need to purchase tons of markers. I suggest a screenless wacom tablet off amazon for about $40 - $70 [or whatever you use works well enough] and gettin a copy of either clipstudio paint or paint tool sai. Study what you wanna go for using pinterest [less ai,] trace if you have to learn shapes [but don't claim traced work as your own!] I majorly studied character designs and body anatomy :D

It took me years to get where I am now. So be patient with yourself, you will have pits where you feel no motivation, you will get mad at yourself sometimes, and it can get frustrating or saddening, but there's always room to get better and pick yourself back up. Someday things will feel breezier than ever and goddamn it's worth working for it