Is it too late for me to learn how to skate?
No. Thank you for waiting. Skate needs your maturity.
No, you're not too old. I'm a grandma and I felt the same uncertainty about snowboarding. My husband is younger than me and convince me that I could do it. I'm so glad I trusted him because if I hadn't, I wouldn't have learned how much fun it is to step out of my comfort zone. I'm in my 60s and still snowboard, run, climb and backpack. Age is a number. The way you deal with life and its challenges is a more honest indication of your age than how many years you've been on this planet. Try it! Good luck and have fun!
It's never too late!
No, age 19 is not too late at all.
It's only too late if you dead or disabled. Until Then learn as much as you want.