Good way to learn is to get a bicycle (borrow maybe?), remove pedals and cruise to build up confidence. Lower the seat, start at a flat ground and just push yourself (as kids do). Then you can move on a slight downhill to gain some speed and learn to operate the brakes. Once that becomes easy you can move onto pedaling.. which is cycling!

this is terrible advice

Actually, this is how I taught my son to ride with one of these skuut bikes:

http://www.twowheelingtots.com/skuut/

You should see my three-year-old on his coaster bike. I can no longer keep up with him, even running. I haven't transitioned him to pedals yet, but I have to feel there's something to the idea that the balance is the hard part and once you're confident in that you can pedal while you do it.

Edit: He became proficient with it slightly after his second birthday. He walked fairly late, too, after 16 months or so. I don't think he could have learned to pedal this early, but he's got the balance, steering, and speed control (braking and accelerating as needed) out of the way. Even knows how to ring a bell when passing people on jogging trails.

I got my niece a tiny one for Christmas. She's one. She loves it! As soon as her feet can touch the ground astride it, she'll be unstoppable!

What's so terrible about it?

I taught my kids this way at ages 5 and 6. It worked very well.

No time like the present to learn! I taught a friend in high school. She learned in about a day.

Chill, you still have 86 years to learn !

I learned to skateboard when I was 22. At first I thought it was impossible, but after about 10 hours of concerted practice it felt natural. Give it a try and don't give up.